Bump phpunit XSD version to 5.2

Some attributes being used in the phpunit configuration files, namely
failOnRisky and failOnWarning were introduced in phpunit 5.2.0. The
Composer configuration shows that tests should run with old versions of
phpunit, but phpunit only validates the configuration against the XSD
since phpunit 7.2.0.
These changes can be tested as follows:

wget http://schema.phpunit.de/5.2/phpunit.xsd
xargs xmllint --schema phpunit.xsd  1>/dev/null
find src -name phpunit.xml.dist| xargs xmllint --schema phpunit.xsd  1>/dev/null

See 7e06a82806
See 46e3745a03/composer.json (L98)

ApcClassLoader.php

@@ -11,15 +11,13 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\ApcClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.', E_USER_DEPRECATED);
-
 /**
  * ApcClassLoader implements a wrapping autoloader cached in APC for PHP 5.3.
  *
  * It expects an object implementing a findFile method to find the file. This
  * allows using it as a wrapper around the other loaders of the component (the
- * ClassLoader for instance) but also around any other autoloaders following
- * this convention (the Composer one for instance).
+ * ClassLoader and the UniversalClassLoader for instance) but also around any
+ * other autoloaders following this convention (the Composer one for instance).
  *
  *     // with a Symfony autoloader
  *     use Symfony\Component\ClassLoader\ClassLoader;
@@ -46,8 +44,6 @@ namespace Symfony\Component\ClassLoader;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
- *
- * @deprecated since version 3.3, to be removed in 4.0. Use `composer install --apcu-autoloader` instead.
  */
 class ApcClassLoader
 {
@@ -69,7 +65,7 @@ class ApcClassLoader
      */
     public function __construct($prefix, $decorated)
     {
-        if (!function_exists('apcu_fetch')) {
+        if (!\function_exists('apcu_fetch')) {
             throw new \RuntimeException('Unable to use ApcClassLoader as APC is not installed.');
         }
 
@@ -138,6 +134,6 @@ class ApcClassLoader
      */
     public function __call($method, $args)
     {
-        return call_user_func_array(array($this->decorated, $method), $args);
+        return \call_user_func_array(array($this->decorated, $method), $args);
     }
 }

ApcUniversalClassLoader.php

@@ -0,0 +1,101 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader;
+
+@trigger_error('The '.__NAMESPACE__.'\ApcUniversalClassLoader class is deprecated since Symfony 2.7 and will be removed in 3.0. Use the Symfony\Component\ClassLoader\ApcClassLoader class instead.', E_USER_DEPRECATED);
+
+/**
+ * ApcUniversalClassLoader implements a "universal" autoloader cached in APC for PHP 5.3.
+ *
+ * It is able to load classes that use either:
+ *
+ *  * The technical interoperability standards for PHP 5.3 namespaces and
+ *    class names (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md);
+ *
+ *  * The PEAR naming convention for classes (http://pear.php.net/).
+ *
+ * Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
+ * looked for in a list of locations to ease the vendoring of a sub-set of
+ * classes for large projects.
+ *
+ * Example usage:
+ *
+ *     require 'vendor/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
+ *     require 'vendor/symfony/src/Symfony/Component/ClassLoader/ApcUniversalClassLoader.php';
+ *
+ *     use Symfony\Component\ClassLoader\ApcUniversalClassLoader;
+ *
+ *     $loader = new ApcUniversalClassLoader('apc.prefix.');
+ *
+ *     // register classes with namespaces
+ *     $loader->registerNamespaces(array(
+ *         'Symfony\Component' => __DIR__.'/component',
+ *         'Symfony' => __DIR__.'/framework',
+ *         'Sensio' => array(__DIR__.'/src', __DIR__.'/vendor'),
+ *     ));
+ *
+ *     // register a library using the PEAR naming convention
+ *     $loader->registerPrefixes(array(
+ *         'Swift_' => __DIR__.'/Swift',
+ *     ));
+ *
+ *     // activate the autoloader
+ *     $loader->register();
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Kris Wallsmith <kris@symfony.com>
+ *
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link ClassLoader} class instead.
+ */
+class ApcUniversalClassLoader extends UniversalClassLoader
+{
+    private $prefix;
+
+    /**
+     * @param string $prefix A prefix to create a namespace in APC
+     *
+     * @throws \RuntimeException
+     */
+    public function __construct($prefix)
+    {
+        if (!\function_exists('apcu_fetch')) {
+            throw new \RuntimeException('Unable to use ApcUniversalClassLoader as APC is not enabled.');
+        }
+
+        $this->prefix = $prefix;
+    }
+
+    /**
+     * Finds a file by class name while caching lookups to APC.
+     *
+     * @param string $class A class name to resolve to file
+     *
+     * @return string|null The path, if found
+     */
+    public function findFile($class)
+    {
+        $file = apcu_fetch($this->prefix.$class, $success);
+
+        if (!$success) {
+            apcu_store($this->prefix.$class, $file = parent::findFile($class) ?: null);
+        }
+
+        return $file;
+    }
+}

CHANGELOG.md

@@ -1,19 +1,6 @@
 CHANGELOG
 =========
 
-3.3.0
------
-
- * deprecated the component: use Composer instead
-
-3.0.0
------
-
- * The DebugClassLoader class has been removed
- * The DebugUniversalClassLoader class has been removed
- * The UniversalClassLoader class has been removed
- * The ApcUniversalClassLoader class has been removed
-
 2.4.0
 -----
 

ClassCollectionLoader.php

@@ -11,16 +11,10 @@
 
 namespace Symfony\Component\ClassLoader;
 
-if (\PHP_VERSION_ID >= 70000) {
-    @trigger_error('The '.__NAMESPACE__.'\ClassCollectionLoader class is deprecated since Symfony 3.3 and will be removed in 4.0.', E_USER_DEPRECATED);
-}
-
 /**
  * ClassCollectionLoader.
  *
  * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since version 3.3, to be removed in 4.0.
  */
 class ClassCollectionLoader
 {
@@ -50,13 +44,16 @@ class ClassCollectionLoader
         self::$loaded[$name] = true;
 
         if ($adaptive) {
-            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());
+            $declared = array_merge(get_declared_classes(), get_declared_interfaces());
+            if (\function_exists('get_declared_traits')) {
+                $declared = array_merge($declared, get_declared_traits());
+            }
 
             // don't include already declared classes
             $classes = array_diff($classes, $declared);
 
             // the cache is different depending on which classes are already declared
-            $name = $name.'-'.substr(hash('sha256', implode('|', $classes)), 0, 5);
+            $name .= '-'.substr(hash('sha256', implode('|', $classes)), 0, 5);
         }
 
         $classes = array_unique($classes);
@@ -65,7 +62,7 @@ class ClassCollectionLoader
         if (!is_dir($cacheDir) && !@mkdir($cacheDir, 0777, true) && !is_dir($cacheDir)) {
             throw new \RuntimeException(sprintf('Class Collection Loader was not able to create directory "%s"', $cacheDir));
         }
-        $cacheDir = rtrim(realpath($cacheDir) ?: $cacheDir, '/'.DIRECTORY_SEPARATOR);
+        $cacheDir = rtrim(realpath($cacheDir) ?: $cacheDir, '/'.\DIRECTORY_SEPARATOR);
         $cache = $cacheDir.'/'.$name.$extension;
 
         // auto-reload
@@ -101,39 +98,10 @@ class ClassCollectionLoader
             return;
         }
         if (!$adaptive) {
-            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());
-        }
-
-        $files = self::inline($classes, $cache, $declared);
-
-        if ($autoReload) {
-            // save the resources
-            self::writeCacheFile($metadata, serialize(array(array_values($files), $classes)));
-        }
-    }
-
-    /**
-     * Generates a file where classes and their parents are inlined.
-     *
-     * @param array  $classes  An array of classes to load
-     * @param string $cache    The file where classes are inlined
-     * @param array  $excluded An array of classes that won't be inlined
-     *
-     * @return array The source map of inlined classes, with classes as keys and files as values
-     *
-     * @throws \RuntimeException When class can't be loaded
-     */
-    public static function inline($classes, $cache, array $excluded)
-    {
-        $declared = array();
-        foreach (self::getOrderedClasses($excluded) as $class) {
-            $declared[$class->getName()] = true;
-        }
-
-        // cache the core classes
-        $cacheDir = dirname($cache);
-        if (!is_dir($cacheDir) && !@mkdir($cacheDir, 0777, true) && !is_dir($cacheDir)) {
-            throw new \RuntimeException(sprintf('Class Collection Loader was not able to create directory "%s"', $cacheDir));
+            $declared = array_merge(get_declared_classes(), get_declared_interfaces());
+            if (\function_exists('get_declared_traits')) {
+                $declared = array_merge($declared, get_declared_traits());
+            }
         }
 
         $spacesRegex = '(?:\s*+(?:(?:\#|//)[^\n]*+\n|/\*(?:(?<!\*/).)++)?+)*+';
@@ -146,20 +114,19 @@ class ClassCollectionLoader
 REGEX;
         $dontInlineRegex = str_replace('.', $spacesRegex, $dontInlineRegex);
 
-        $cacheDir = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $cacheDir));
+        $cacheDir = explode('/', str_replace(\DIRECTORY_SEPARATOR, '/', $cacheDir));
         $files = array();
         $content = '';
         foreach (self::getOrderedClasses($classes) as $class) {
-            if (isset($declared[$class->getName()])) {
+            if (\in_array($class->getName(), $declared)) {
                 continue;
             }
-            $declared[$class->getName()] = true;
 
-            $files[$class->getName()] = $file = $class->getFileName();
+            $files[] = $file = $class->getFileName();
             $c = file_get_contents($file);
 
             if (preg_match($dontInlineRegex, $c)) {
-                $file = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $file));
+                $file = explode('/', str_replace(\DIRECTORY_SEPARATOR, '/', $file));
 
                 for ($i = 0; isset($file[$i], $cacheDir[$i]); ++$i) {
                     if ($file[$i] !== $cacheDir[$i]) {
@@ -169,8 +136,8 @@ REGEX;
                 if (1 >= $i) {
                     $file = var_export(implode('/', $file), true);
                 } else {
-                    $file = array_slice($file, $i);
-                    $file = str_repeat('../', count($cacheDir) - $i).implode('/', $file);
+                    $file = \array_slice($file, $i);
+                    $file = str_repeat('../', \count($cacheDir) - $i).implode('/', $file);
                     $file = '__DIR__.'.var_export('/'.$file, true);
                 }
 
@@ -191,7 +158,10 @@ REGEX;
         }
         self::writeCacheFile($cache, '<?php '.$content);
 
-        return $files;
+        if ($autoReload) {
+            // save the resources
+            self::writeCacheFile($metadata, serialize(array($files, $classes)));
+        }
     }
 
     /**
@@ -203,7 +173,7 @@ REGEX;
      */
     public static function fixNamespaceDeclarations($source)
     {
-        if (!function_exists('token_get_all') || !self::$useTokenizer) {
+        if (!\function_exists('token_get_all') || !self::$useTokenizer) {
             if (preg_match('/(^|\s)namespace(.*?)\s*;/', $source)) {
                 $source = preg_replace('/(^|\s)namespace(.*?)\s*;/', "$1namespace$2\n{", $source)."}\n";
             }
@@ -220,7 +190,7 @@ REGEX;
             $token = $tokens[$i];
             if (!isset($token[1]) || 'b"' === $token) {
                 $rawChunk .= $token;
-            } elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
+            } elseif (\in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
                 // strip comments
                 continue;
             } elseif (T_NAMESPACE === $token[0]) {
@@ -230,7 +200,7 @@ REGEX;
                 $rawChunk .= $token[1];
 
                 // namespace name and whitespaces
-                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
+                while (isset($tokens[++$i][1]) && \in_array($tokens[$i][0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
                     $rawChunk .= $tokens[$i][1];
                 }
                 if ('{' === $tokens[$i]) {
@@ -305,7 +275,7 @@ REGEX;
      */
     private static function writeCacheFile($file, $content)
     {
-        $dir = dirname($file);
+        $dir = \dirname($file);
         if (!is_writable($dir)) {
             throw new \RuntimeException(sprintf('Cache directory "%s" is not writable.', $dir));
         }
@@ -363,10 +333,12 @@ REGEX;
 
         $traits = array();
 
-        foreach ($classes as $c) {
-            foreach (self::resolveDependencies(self::computeTraitDeps($c), $c) as $trait) {
-                if ($trait !== $c) {
-                    $traits[] = $trait;
+        if (method_exists('ReflectionClass', 'getTraits')) {
+            foreach ($classes as $c) {
+                foreach (self::resolveDependencies(self::computeTraitDeps($c), $c) as $trait) {
+                    if ($trait !== $c) {
+                        $traits[] = $trait;
+                    }
                 }
             }
         }

ClassLoader.php

@@ -11,8 +11,6 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\ClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use Composer instead.', E_USER_DEPRECATED);
-
 /**
  * ClassLoader implements an PSR-0 class loader.
  *
@@ -38,8 +36,6 @@ namespace Symfony\Component\ClassLoader;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Jordi Boggiano <j.boggiano@seld.be>
- *
- * @deprecated since version 3.3, to be removed in 4.0.
  */
 class ClassLoader
 {
@@ -95,12 +91,12 @@ class ClassLoader
             return;
         }
         if (isset($this->prefixes[$prefix])) {
-            if (is_array($paths)) {
+            if (\is_array($paths)) {
                 $this->prefixes[$prefix] = array_unique(array_merge(
                     $this->prefixes[$prefix],
                     $paths
                 ));
-            } elseif (!in_array($paths, $this->prefixes[$prefix])) {
+            } elseif (!\in_array($paths, $this->prefixes[$prefix])) {
                 $this->prefixes[$prefix][] = $paths;
             }
         } else {
@@ -174,7 +170,7 @@ class ClassLoader
     {
         if (false !== $pos = strrpos($class, '\\')) {
             // namespaced class name
-            $classPath = str_replace('\\', DIRECTORY_SEPARATOR, substr($class, 0, $pos)).DIRECTORY_SEPARATOR;
+            $classPath = str_replace('\\', \DIRECTORY_SEPARATOR, substr($class, 0, $pos)).\DIRECTORY_SEPARATOR;
             $className = substr($class, $pos + 1);
         } else {
             // PEAR-like class name
@@ -182,21 +178,21 @@ class ClassLoader
             $className = $class;
         }
 
-        $classPath .= str_replace('_', DIRECTORY_SEPARATOR, $className).'.php';
+        $classPath .= str_replace('_', \DIRECTORY_SEPARATOR, $className).'.php';
 
         foreach ($this->prefixes as $prefix => $dirs) {
             if ($class === strstr($class, $prefix)) {
                 foreach ($dirs as $dir) {
-                    if (file_exists($dir.DIRECTORY_SEPARATOR.$classPath)) {
-                        return $dir.DIRECTORY_SEPARATOR.$classPath;
+                    if (file_exists($dir.\DIRECTORY_SEPARATOR.$classPath)) {
+                        return $dir.\DIRECTORY_SEPARATOR.$classPath;
                     }
                 }
             }
         }
 
         foreach ($this->fallbackDirs as $dir) {
-            if (file_exists($dir.DIRECTORY_SEPARATOR.$classPath)) {
-                return $dir.DIRECTORY_SEPARATOR.$classPath;
+            if (file_exists($dir.\DIRECTORY_SEPARATOR.$classPath)) {
+                return $dir.\DIRECTORY_SEPARATOR.$classPath;
             }
         }
 

ClassMapGenerator.php

@@ -11,14 +11,18 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\ClassMapGenerator class is deprecated since Symfony 3.3 and will be removed in 4.0. Use Composer instead.', E_USER_DEPRECATED);
+if (!\defined('SYMFONY_TRAIT')) {
+    if (\PHP_VERSION_ID >= 50400) {
+        \define('SYMFONY_TRAIT', T_TRAIT);
+    } else {
+        \define('SYMFONY_TRAIT', 0);
+    }
+}
 
 /**
  * ClassMapGenerator.
  *
  * @author Gyula Sallai <salla016@gmail.com>
- *
- * @deprecated since version 3.3, to be removed in 4.0.
  */
 class ClassMapGenerator
 {
@@ -49,7 +53,7 @@ class ClassMapGenerator
      */
     public static function createMap($dir)
     {
-        if (is_string($dir)) {
+        if (\is_string($dir)) {
             $dir = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir));
         }
 
@@ -110,7 +114,7 @@ class ClassMapGenerator
                     $namespace = '';
                     // If there is a namespace, extract it
                     while (isset($tokens[++$i][1])) {
-                        if (in_array($tokens[$i][0], array(T_STRING, T_NS_SEPARATOR))) {
+                        if (\in_array($tokens[$i][0], array(T_STRING, T_NS_SEPARATOR))) {
                             $namespace .= $tokens[$i][1];
                         }
                     }
@@ -118,7 +122,7 @@ class ClassMapGenerator
                     break;
                 case T_CLASS:
                 case T_INTERFACE:
-                case T_TRAIT:
+                case SYMFONY_TRAIT:
                     // Skip usage of ::class constant
                     $isClassConstant = false;
                     for ($j = $i - 1; $j > 0; --$j) {
@@ -129,7 +133,7 @@ class ClassMapGenerator
                         if (T_DOUBLE_COLON === $tokens[$j][0]) {
                             $isClassConstant = true;
                             break;
-                        } elseif (!in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
+                        } elseif (!\in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
                             break;
                         }
                     }

DebugClassLoader.php

@@ -0,0 +1,118 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader;
+
+@trigger_error('The '.__NAMESPACE__.'\DebugClassLoader class is deprecated since Symfony 2.4 and will be removed in 3.0. Use the Symfony\Component\Debug\DebugClassLoader class instead.', E_USER_DEPRECATED);
+
+/**
+ * Autoloader checking if the class is really defined in the file found.
+ *
+ * The DebugClassLoader will wrap all registered autoloaders providing a
+ * findFile method and will throw an exception if a file is found but does
+ * not declare the class.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Christophe Coevoet <stof@notk.org>
+ *
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use {@link \Symfony\Component\Debug\DebugClassLoader} instead.
+ */
+class DebugClassLoader
+{
+    private $classFinder;
+
+    /**
+     * @param object $classFinder
+     */
+    public function __construct($classFinder)
+    {
+        $this->classFinder = $classFinder;
+    }
+
+    /**
+     * Gets the wrapped class loader.
+     *
+     * @return object a class loader instance
+     */
+    public function getClassLoader()
+    {
+        return $this->classFinder;
+    }
+
+    /**
+     * Replaces all autoloaders implementing a findFile method by a DebugClassLoader wrapper.
+     */
+    public static function enable()
+    {
+        if (!\is_array($functions = spl_autoload_functions())) {
+            return;
+        }
+
+        foreach ($functions as $function) {
+            spl_autoload_unregister($function);
+        }
+
+        foreach ($functions as $function) {
+            if (\is_array($function) && !$function[0] instanceof self && method_exists($function[0], 'findFile')) {
+                $function = array(new static($function[0]), 'loadClass');
+            }
+
+            spl_autoload_register($function);
+        }
+    }
+
+    /**
+     * Unregisters this instance as an autoloader.
+     */
+    public function unregister()
+    {
+        spl_autoload_unregister(array($this, 'loadClass'));
+    }
+
+    /**
+     * Finds a file by class name.
+     *
+     * @param string $class A class name to resolve to file
+     *
+     * @return string|null
+     */
+    public function findFile($class)
+    {
+        return $this->classFinder->findFile($class) ?: null;
+    }
+
+    /**
+     * Loads the given class or interface.
+     *
+     * @param string $class The name of the class
+     *
+     * @return bool|null True, if loaded
+     *
+     * @throws \RuntimeException
+     */
+    public function loadClass($class)
+    {
+        if ($file = $this->classFinder->findFile($class)) {
+            require $file;
+
+            if (!class_exists($class, false) && !interface_exists($class, false) && (!\function_exists('trait_exists') || !trait_exists($class, false))) {
+                if (false !== strpos($class, '/')) {
+                    throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
+                }
+
+                throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
+            }
+
+            return true;
+        }
+    }
+}

DebugUniversalClassLoader.php

@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader;
+
+@trigger_error('The '.__NAMESPACE__.'\DebugUniversalClassLoader class is deprecated since Symfony 2.4 and will be removed in 3.0. Use the Symfony\Component\Debug\DebugClassLoader class instead.', E_USER_DEPRECATED);
+
+/**
+ * Checks that the class is actually declared in the included file.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link \Symfony\Component\Debug\DebugClassLoader} class instead.
+ */
+class DebugUniversalClassLoader extends UniversalClassLoader
+{
+    /**
+     * Replaces all regular UniversalClassLoader instances by a DebugUniversalClassLoader ones.
+     */
+    public static function enable()
+    {
+        if (!\is_array($functions = spl_autoload_functions())) {
+            return;
+        }
+
+        foreach ($functions as $function) {
+            spl_autoload_unregister($function);
+        }
+
+        foreach ($functions as $function) {
+            if (\is_array($function) && $function[0] instanceof UniversalClassLoader) {
+                $loader = new static();
+                $loader->registerNamespaceFallbacks($function[0]->getNamespaceFallbacks());
+                $loader->registerPrefixFallbacks($function[0]->getPrefixFallbacks());
+                $loader->registerNamespaces($function[0]->getNamespaces());
+                $loader->registerPrefixes($function[0]->getPrefixes());
+                $loader->useIncludePath($function[0]->getUseIncludePath());
+
+                $function[0] = $loader;
+            }
+
+            spl_autoload_register($function);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function loadClass($class)
+    {
+        if ($file = $this->findFile($class)) {
+            require $file;
+
+            if (!class_exists($class, false) && !interface_exists($class, false) && (!\function_exists('trait_exists') || !trait_exists($class, false))) {
+                throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
+            }
+        }
+    }
+}

MapClassLoader.php

@@ -11,14 +11,10 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\MapClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use Composer instead.', E_USER_DEPRECATED);
-
 /**
  * A class loader that uses a mapping file to look up paths.
  *
  * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since version 3.3, to be removed in 4.0.
  */
 class MapClassLoader
 {

Psr4ClassLoader.php

@@ -11,16 +11,12 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\Psr4ClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use Composer instead.', E_USER_DEPRECATED);
-
 /**
  * A PSR-4 compatible class loader.
  *
  * See http://www.php-fig.org/psr/psr-4/
  *
  * @author Alexander M. Turek <me@derrabus.de>
- *
- * @deprecated since version 3.3, to be removed in 4.0.
  */
 class Psr4ClassLoader
 {
@@ -33,7 +29,7 @@ class Psr4ClassLoader
     public function addPrefix($prefix, $baseDir)
     {
         $prefix = trim($prefix, '\\').'\\';
-        $baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+        $baseDir = rtrim($baseDir, \DIRECTORY_SEPARATOR).\DIRECTORY_SEPARATOR;
         $this->prefixes[] = array($prefix, $baseDir);
     }
 
@@ -46,10 +42,11 @@ class Psr4ClassLoader
     {
         $class = ltrim($class, '\\');
 
-        foreach ($this->prefixes as list($currentPrefix, $currentBaseDir)) {
+        foreach ($this->prefixes as $current) {
+            list($currentPrefix, $currentBaseDir) = $current;
             if (0 === strpos($class, $currentPrefix)) {
-                $classWithoutPrefix = substr($class, strlen($currentPrefix));
-                $file = $currentBaseDir.str_replace('\\', DIRECTORY_SEPARATOR, $classWithoutPrefix).'.php';
+                $classWithoutPrefix = substr($class, \strlen($currentPrefix));
+                $file = $currentBaseDir.str_replace('\\', \DIRECTORY_SEPARATOR, $classWithoutPrefix).'.php';
                 if (file_exists($file)) {
                     return $file;
                 }

Tests/ApcClassLoaderTest.php

@@ -15,14 +15,11 @@ use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ApcClassLoader;
 use Symfony\Component\ClassLoader\ClassLoader;
 
-/**
- * @group legacy
- */
 class ApcClassLoaderTest extends TestCase
 {
     protected function setUp()
     {
-        if (!(ini_get('apc.enabled') && ini_get('apc.enable_cli'))) {
+        if (!(filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
             $this->markTestSkipped('The apc extension is not enabled.');
         } else {
             apcu_clear_cache();
@@ -31,7 +28,7 @@ class ApcClassLoaderTest extends TestCase
 
     protected function tearDown()
     {
-        if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+        if (filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN)) {
             apcu_clear_cache();
         }
     }
@@ -39,7 +36,7 @@ class ApcClassLoaderTest extends TestCase
     public function testConstructor()
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
 
         $loader = new ApcClassLoader('test.prefix.', $loader);
 
@@ -52,8 +49,8 @@ class ApcClassLoaderTest extends TestCase
     public function testLoadClass($className, $testClassName, $message)
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Apc_Pearlike_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
 
         $loader = new ApcClassLoader('test.prefix.', $loader);
         $loader->loadClass($testClassName);
@@ -74,9 +71,9 @@ class ApcClassLoaderTest extends TestCase
     public function testLoadClassFromFallback($className, $testClassName, $message)
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Apc_Pearlike_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('', array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/fallback'));
+        $loader->addPrefix('Apc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Apc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('', array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/fallback'));
 
         $loader = new ApcClassLoader('test.prefix.fallback', $loader);
         $loader->loadClass($testClassName);
@@ -113,32 +110,32 @@ class ApcClassLoaderTest extends TestCase
         return array(
            array(
                array(
-                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
-                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
                ),
                'Apc\NamespaceCollision\A\Foo',
                '->loadClass() loads NamespaceCollision\A\Foo from alpha.',
            ),
            array(
                array(
-                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
-                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
                ),
                'Apc\NamespaceCollision\A\Bar',
                '->loadClass() loads NamespaceCollision\A\Bar from alpha.',
            ),
            array(
                array(
-                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
-                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
                ),
                'Apc\NamespaceCollision\A\B\Foo',
                '->loadClass() loads NamespaceCollision\A\B\Foo from beta.',
            ),
            array(
                array(
-                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
-                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
                ),
                'Apc\NamespaceCollision\A\B\Bar',
                '->loadClass() loads NamespaceCollision\A\B\Bar from beta.',
@@ -165,32 +162,32 @@ class ApcClassLoaderTest extends TestCase
         return array(
            array(
                array(
-                   'ApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
-                   'ApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
                ),
                'ApcPrefixCollision_A_Foo',
                '->loadClass() loads ApcPrefixCollision_A_Foo from alpha.',
            ),
            array(
                array(
-                   'ApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
-                   'ApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
                ),
                'ApcPrefixCollision_A_Bar',
                '->loadClass() loads ApcPrefixCollision_A_Bar from alpha.',
            ),
            array(
                array(
-                   'ApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
-                   'ApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
                ),
                'ApcPrefixCollision_A_B_Foo',
                '->loadClass() loads ApcPrefixCollision_A_B_Foo from beta.',
            ),
            array(
                array(
-                   'ApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
-                   'ApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
+                   'ApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'ApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
                ),
                'ApcPrefixCollision_A_B_Bar',
                '->loadClass() loads ApcPrefixCollision_A_B_Bar from beta.',

Tests/ClassCollectionLoaderTest.php

@@ -13,19 +13,17 @@ namespace Symfony\Component\ClassLoader\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassCollectionLoader;
-use Symfony\Component\ClassLoader\Tests\Fixtures\DeclaredClass;
-use Symfony\Component\ClassLoader\Tests\Fixtures\WarmedClass;
 
 require_once __DIR__.'/Fixtures/ClassesWithParents/GInterface.php';
 require_once __DIR__.'/Fixtures/ClassesWithParents/CInterface.php';
 require_once __DIR__.'/Fixtures/ClassesWithParents/B.php';
 require_once __DIR__.'/Fixtures/ClassesWithParents/A.php';
 
-/**
- * @group legacy
- */
 class ClassCollectionLoaderTest extends TestCase
 {
+    /**
+     * @requires PHP 5.4
+     */
     public function testTraitDependencies()
     {
         require_once __DIR__.'/Fixtures/deps/traits.php';
@@ -97,6 +95,7 @@ class ClassCollectionLoaderTest extends TestCase
 
     /**
      * @dataProvider getDifferentOrdersForTraits
+     * @requires PHP 5.4
      */
     public function testClassWithTraitsReordering(array $classes)
     {
@@ -140,6 +139,9 @@ class ClassCollectionLoaderTest extends TestCase
         );
     }
 
+    /**
+     * @requires PHP 5.4
+     */
     public function testFixClassWithTraitsOrdering()
     {
         require_once __DIR__.'/Fixtures/ClassesWithParents/CTrait.php';
@@ -231,7 +233,7 @@ class ClassCollectionLoaderTest extends TestCase
             }
         });
 
-        $strictTypes = defined('HHVM_VERSION') ? '' : "\nnamespace {require __DIR__.'/Fixtures/Namespaced/WithStrictTypes.php';}";
+        $strictTypes = \defined('HHVM_VERSION') ? '' : "\nnamespace {require __DIR__.'/Fixtures/Namespaced/WithStrictTypes.php';}";
 
         ClassCollectionLoader::load(
             array('Namespaced\\WithComments', 'Pearlike_WithComments', 'Namespaced\\WithDirMagic', 'Namespaced\\WithFileMagic', 'Namespaced\\WithHaltCompiler', $strictTypes ? 'Namespaced\\WithStrictTypes' : 'Namespaced\\WithComments'),
@@ -284,36 +286,4 @@ EOF
 
         unlink($file);
     }
-
-    public function testInline()
-    {
-        $this->assertTrue(class_exists(WarmedClass::class, true));
-
-        @unlink($cache = sys_get_temp_dir().'/inline.php');
-
-        $classes = array(WarmedClass::class);
-        $excluded = array(DeclaredClass::class);
-
-        ClassCollectionLoader::inline($classes, $cache, $excluded);
-
-        $this->assertSame(<<<'EOTXT'
-<?php 
-namespace Symfony\Component\ClassLoader\Tests\Fixtures
-{
-interface WarmedInterface
-{
-}
-}
-namespace Symfony\Component\ClassLoader\Tests\Fixtures
-{
-class WarmedClass extends DeclaredClass implements WarmedInterface
-{
-}
-}
-EOTXT
-            , file_get_contents($cache)
-        );
-
-        unlink($cache);
-    }
 }

Tests/ClassLoaderTest.php

@@ -14,17 +14,14 @@ namespace Symfony\Component\ClassLoader\Tests;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassLoader;
 
-/**
- * @group legacy
- */
 class ClassLoaderTest extends TestCase
 {
     public function testGetPrefixes()
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Foo', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Bar', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Bas', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Foo', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Bar', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Bas', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $prefixes = $loader->getPrefixes();
         $this->assertArrayHasKey('Foo', $prefixes);
         $this->assertArrayNotHasKey('Foo1', $prefixes);
@@ -35,8 +32,8 @@ class ClassLoaderTest extends TestCase
     public function testGetFallbackDirs()
     {
         $loader = new ClassLoader();
-        $loader->addPrefix(null, __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix(null, __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix(null, __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix(null, __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $fallback_dirs = $loader->getFallbackDirs();
         $this->assertCount(2, $fallback_dirs);
     }
@@ -47,8 +44,8 @@ class ClassLoaderTest extends TestCase
     public function testLoadClass($className, $testClassName, $message)
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Namespaced2\\', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Pearlike2_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Namespaced2\\', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Pearlike2_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $loader->loadClass($testClassName);
         $this->assertTrue(class_exists($className), $message);
     }
@@ -67,8 +64,8 @@ class ClassLoaderTest extends TestCase
     public function testLoadNonexistentClass($className, $testClassName, $message)
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Namespaced2\\', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Pearlike2_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Namespaced2\\', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Pearlike2_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $loader->loadClass($testClassName);
         $this->assertFalse(class_exists($className), $message);
     }
@@ -83,8 +80,8 @@ class ClassLoaderTest extends TestCase
     public function testAddPrefixSingle()
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Foo', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Foo', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Foo', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Foo', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
         $prefixes = $loader->getPrefixes();
         $this->assertArrayHasKey('Foo', $prefixes);
         $this->assertCount(1, $prefixes['Foo']);
@@ -126,7 +123,7 @@ class ClassLoaderTest extends TestCase
 
         set_include_path(__DIR__.'/Fixtures/includepath'.PATH_SEPARATOR.$includePath);
 
-        $this->assertEquals(__DIR__.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR.'includepath'.DIRECTORY_SEPARATOR.'Foo.php', $loader->findFile('Foo'));
+        $this->assertEquals(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.'includepath'.\DIRECTORY_SEPARATOR.'Foo.php', $loader->findFile('Foo'));
 
         set_include_path($includePath);
     }
@@ -137,9 +134,9 @@ class ClassLoaderTest extends TestCase
     public function testLoadClassFromFallback($className, $testClassName, $message)
     {
         $loader = new ClassLoader();
-        $loader->addPrefix('Namespaced2\\', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('Pearlike2_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-        $loader->addPrefix('', array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures/fallback'));
+        $loader->addPrefix('Namespaced2\\', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('Pearlike2_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->addPrefix('', array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/fallback'));
         $loader->loadClass($testClassName);
         $this->assertTrue(class_exists($className), $message);
     }
@@ -171,64 +168,64 @@ class ClassLoaderTest extends TestCase
         return array(
             array(
                 array(
-                    'NamespaceCollision\\C' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
-                    'NamespaceCollision\\C\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\C' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\C\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
                 ),
                 'NamespaceCollision\C\Foo',
                 '->loadClass() loads NamespaceCollision\C\Foo from alpha.',
             ),
             array(
                 array(
-                    'NamespaceCollision\\C\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
-                    'NamespaceCollision\\C' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\C\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\C' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
                 ),
                 'NamespaceCollision\C\Bar',
                 '->loadClass() loads NamespaceCollision\C\Bar from alpha.',
             ),
             array(
                 array(
-                    'NamespaceCollision\\C' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
-                    'NamespaceCollision\\C\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\C' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\C\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
                 ),
                 'NamespaceCollision\C\B\Foo',
                 '->loadClass() loads NamespaceCollision\C\B\Foo from beta.',
             ),
             array(
                 array(
-                    'NamespaceCollision\\C\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
-                    'NamespaceCollision\\C' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\C\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\C' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
                 ),
                 'NamespaceCollision\C\B\Bar',
                 '->loadClass() loads NamespaceCollision\C\B\Bar from beta.',
             ),
             array(
                 array(
-                    'PrefixCollision_C_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
-                    'PrefixCollision_C_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_C_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_C_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
                 ),
                 'PrefixCollision_C_Foo',
                 '->loadClass() loads PrefixCollision_C_Foo from alpha.',
             ),
             array(
                 array(
-                    'PrefixCollision_C_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
-                    'PrefixCollision_C_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_C_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_C_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
                 ),
                 'PrefixCollision_C_Bar',
                 '->loadClass() loads PrefixCollision_C_Bar from alpha.',
             ),
             array(
                 array(
-                    'PrefixCollision_C_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
-                    'PrefixCollision_C_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_C_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_C_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
                 ),
                 'PrefixCollision_C_B_Foo',
                 '->loadClass() loads PrefixCollision_C_B_Foo from beta.',
             ),
             array(
                 array(
-                    'PrefixCollision_C_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/beta',
-                    'PrefixCollision_C_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_C_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_C_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
                 ),
                 'PrefixCollision_C_B_Bar',
                 '->loadClass() loads PrefixCollision_C_B_Bar from beta.',

Tests/ClassMapGeneratorTest.php

@@ -14,9 +14,6 @@ namespace Symfony\Component\ClassLoader\Tests;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassMapGenerator;
 
-/**
- * @group legacy
- */
 class ClassMapGeneratorTest extends TestCase
 {
     /**
@@ -109,18 +106,24 @@ class ClassMapGeneratorTest extends TestCase
                 'ClassMap\\SomeParent' => realpath(__DIR__).'/Fixtures/classmap/SomeParent.php',
                 'ClassMap\\SomeClass' => realpath(__DIR__).'/Fixtures/classmap/SomeClass.php',
             )),
-            array(__DIR__.'/Fixtures/php5.4', array(
+        );
+
+        if (\PHP_VERSION_ID >= 50400) {
+            $data[] = array(__DIR__.'/Fixtures/php5.4', array(
                 'TFoo' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'CFoo' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'Foo\\TBar' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'Foo\\IBar' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'Foo\\TFooBar' => __DIR__.'/Fixtures/php5.4/traits.php',
                 'Foo\\CBar' => __DIR__.'/Fixtures/php5.4/traits.php',
-            )),
-            array(__DIR__.'/Fixtures/php5.5', array(
+            ));
+        }
+
+        if (\PHP_VERSION_ID >= 50500) {
+            $data[] = array(__DIR__.'/Fixtures/php5.5', array(
                 'ClassCons\\Foo' => __DIR__.'/Fixtures/php5.5/class_cons.php',
-            )),
-        );
+            ));
+        }
 
         return $data;
     }

Tests/Fixtures/DeclaredClass.php

@@ -1,7 +0,0 @@
-<?php
-
-namespace Symfony\Component\ClassLoader\Tests\Fixtures;
-
-class DeclaredClass implements DeclaredInterface
-{
-}

Tests/Fixtures/DeclaredInterface.php

@@ -1,7 +0,0 @@
-<?php
-
-namespace Symfony\Component\ClassLoader\Tests\Fixtures;
-
-interface DeclaredInterface
-{
-}

Tests/Fixtures/LegacyApc/Namespaced/Bar.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\Namespaced;
+
+class Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Namespaced/Baz.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\Namespaced;
+
+class Baz
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Namespaced/Foo.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\Namespaced;
+
+class Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Namespaced/FooBar.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\Namespaced;
+
+class FooBar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Pearlike/Bar.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApc_Pearlike_Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Pearlike/Baz.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApc_Pearlike_Baz
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/Pearlike/Foo.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApc_Pearlike_Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/alpha/LegacyApc/LegacyApcPrefixCollision/A/Bar.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApcPrefixCollision_A_Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/alpha/LegacyApc/LegacyApcPrefixCollision/A/Foo.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApcPrefixCollision_A_Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/alpha/LegacyApc/NamespaceCollision/A/Bar.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\NamespaceCollision\A;
+
+class Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/alpha/LegacyApc/NamespaceCollision/A/Foo.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\NamespaceCollision\A;
+
+class Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/beta/LegacyApc/LegacyApcPrefixCollision/A/B/Bar.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApcPrefixCollision_A_B_Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/beta/LegacyApc/LegacyApcPrefixCollision/A/B/Foo.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApcPrefixCollision_A_B_Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/beta/LegacyApc/NamespaceCollision/A/B/Bar.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\NamespaceCollision\A\B;
+
+class Bar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/beta/LegacyApc/NamespaceCollision/A/B/Foo.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\NamespaceCollision\A\B;
+
+class Foo
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/fallback/LegacyApc/Pearlike/FooBar.php

@@ -0,0 +1,6 @@
+<?php
+
+class LegacyApc_Pearlike_FooBar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/LegacyApc/fallback/Namespaced/FooBar.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace LegacyApc\Namespaced;
+
+class FooBar
+{
+    public static $loaded = true;
+}

Tests/Fixtures/WarmedClass.php

@@ -1,7 +0,0 @@
-<?php
-
-namespace Symfony\Component\ClassLoader\Tests\Fixtures;
-
-class WarmedClass extends DeclaredClass implements WarmedInterface
-{
-}

Tests/Fixtures/WarmedInterface.php

@@ -1,7 +0,0 @@
-<?php
-
-namespace Symfony\Component\ClassLoader\Tests\Fixtures;
-
-interface WarmedInterface
-{
-}

Tests/LegacyApcUniversalClassLoaderTest.php

@@ -0,0 +1,190 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ClassLoader\ApcUniversalClassLoader;
+
+/**
+ * @group legacy
+ */
+class LegacyApcUniversalClassLoaderTest extends TestCase
+{
+    protected function setUp()
+    {
+        if (filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN)) {
+            apcu_clear_cache();
+        } else {
+            $this->markTestSkipped('APC is not enabled.');
+        }
+    }
+
+    protected function tearDown()
+    {
+        if (filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) && filter_var(ini_get('apc.enable_cli'), FILTER_VALIDATE_BOOLEAN)) {
+            apcu_clear_cache();
+        }
+    }
+
+    public function testConstructor()
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.');
+        $loader->registerNamespace('LegacyApc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+
+        $this->assertEquals($loader->findFile('\LegacyApc\Namespaced\FooBar'), apcu_fetch('test.prefix.\LegacyApc\Namespaced\FooBar'), '__construct() takes a prefix as its first argument');
+    }
+
+    /**
+     * @dataProvider getLoadClassTests
+     */
+    public function testLoadClass($className, $testClassName, $message)
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.');
+        $loader->registerNamespace('LegacyApc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('LegacyApc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->loadClass($testClassName);
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassTests()
+    {
+        return array(
+           array('\\LegacyApc\\Namespaced\\Foo', 'LegacyApc\\Namespaced\\Foo',   '->loadClass() loads LegacyApc\Namespaced\Foo class'),
+           array('LegacyApc_Pearlike_Foo',    'LegacyApc_Pearlike_Foo',      '->loadClass() loads LegacyApc_Pearlike_Foo class'),
+       );
+    }
+
+    /**
+     * @dataProvider getLoadClassFromFallbackTests
+     */
+    public function testLoadClassFromFallback($className, $testClassName, $message)
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.fallback');
+        $loader->registerNamespace('LegacyApc\Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('LegacyApc_Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerNamespaceFallbacks(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/fallback'));
+        $loader->registerPrefixFallbacks(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/fallback'));
+        $loader->loadClass($testClassName);
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassFromFallbackTests()
+    {
+        return array(
+           array('\\LegacyApc\\Namespaced\\Baz',    'LegacyApc\\Namespaced\\Baz',    '->loadClass() loads LegacyApc\Namespaced\Baz class'),
+           array('LegacyApc_Pearlike_Baz',       'LegacyApc_Pearlike_Baz',       '->loadClass() loads LegacyApc_Pearlike_Baz class'),
+           array('\\LegacyApc\\Namespaced\\FooBar', 'LegacyApc\\Namespaced\\FooBar', '->loadClass() loads LegacyApc\Namespaced\Baz class from fallback dir'),
+           array('LegacyApc_Pearlike_FooBar',    'LegacyApc_Pearlike_FooBar',    '->loadClass() loads LegacyApc_Pearlike_Baz class from fallback dir'),
+       );
+    }
+
+    /**
+     * @dataProvider getLoadClassNamespaceCollisionTests
+     */
+    public function testLoadClassNamespaceCollision($namespaces, $className, $message)
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.collision.');
+        $loader->registerNamespaces($namespaces);
+
+        $loader->loadClass($className);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassNamespaceCollisionTests()
+    {
+        return array(
+           array(
+               array(
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+               ),
+               'LegacyApc\NamespaceCollision\A\Foo',
+               '->loadClass() loads NamespaceCollision\A\Foo from alpha.',
+           ),
+           array(
+               array(
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+               ),
+               'LegacyApc\NamespaceCollision\A\Bar',
+               '->loadClass() loads NamespaceCollision\A\Bar from alpha.',
+           ),
+           array(
+               array(
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+               ),
+               'LegacyApc\NamespaceCollision\A\B\Foo',
+               '->loadClass() loads NamespaceCollision\A\B\Foo from beta.',
+           ),
+           array(
+               array(
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+               ),
+               'LegacyApc\NamespaceCollision\A\B\Bar',
+               '->loadClass() loads NamespaceCollision\A\B\Bar from beta.',
+           ),
+       );
+    }
+
+    /**
+     * @dataProvider getLoadClassPrefixCollisionTests
+     */
+    public function testLoadClassPrefixCollision($prefixes, $className, $message)
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.collision.');
+        $loader->registerPrefixes($prefixes);
+
+        $loader->loadClass($className);
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassPrefixCollisionTests()
+    {
+        return array(
+           array(
+               array(
+                   'LegacyApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+               ),
+               'LegacyApcPrefixCollision_A_Foo',
+               '->loadClass() loads LegacyApcPrefixCollision_A_Foo from alpha.',
+           ),
+           array(
+               array(
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+               ),
+               'LegacyApcPrefixCollision_A_Bar',
+               '->loadClass() loads LegacyApcPrefixCollision_A_Bar from alpha.',
+           ),
+           array(
+               array(
+                   'LegacyApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+               ),
+               'LegacyApcPrefixCollision_A_B_Foo',
+               '->loadClass() loads LegacyApcPrefixCollision_A_B_Foo from beta.',
+           ),
+           array(
+               array(
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+               ),
+               'LegacyApcPrefixCollision_A_B_Bar',
+               '->loadClass() loads LegacyApcPrefixCollision_A_B_Bar from beta.',
+           ),
+       );
+    }
+}

Tests/LegacyUniversalClassLoaderTest.php

@@ -0,0 +1,224 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ClassLoader\UniversalClassLoader;
+
+/**
+ * @group legacy
+ */
+class LegacyUniversalClassLoaderTest extends TestCase
+{
+    /**
+     * @dataProvider getLoadClassTests
+     */
+    public function testLoadClass($className, $testClassName, $message)
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerNamespace('Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $this->assertTrue($loader->loadClass($testClassName));
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassTests()
+    {
+        return array(
+            array('\\Namespaced\\Foo', 'Namespaced\\Foo',   '->loadClass() loads Namespaced\Foo class'),
+            array('\\Pearlike_Foo',    'Pearlike_Foo',      '->loadClass() loads Pearlike_Foo class'),
+        );
+    }
+
+    public function testUseIncludePath()
+    {
+        $loader = new UniversalClassLoader();
+        $this->assertFalse($loader->getUseIncludePath());
+
+        $this->assertNull($loader->findFile('Foo'));
+
+        $includePath = get_include_path();
+
+        $loader->useIncludePath(true);
+        $this->assertTrue($loader->getUseIncludePath());
+
+        set_include_path(__DIR__.'/Fixtures/includepath'.PATH_SEPARATOR.$includePath);
+
+        $this->assertEquals(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.'includepath'.\DIRECTORY_SEPARATOR.'Foo.php', $loader->findFile('Foo'));
+
+        set_include_path($includePath);
+    }
+
+    public function testGetNamespaces()
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerNamespace('Foo', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerNamespace('Bar', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerNamespace('Bas', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $namespaces = $loader->getNamespaces();
+        $this->assertArrayHasKey('Foo', $namespaces);
+        $this->assertArrayNotHasKey('Foo1', $namespaces);
+        $this->assertArrayHasKey('Bar', $namespaces);
+        $this->assertArrayHasKey('Bas', $namespaces);
+    }
+
+    public function testGetPrefixes()
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerPrefix('Foo', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('Bar', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('Bas', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $prefixes = $loader->getPrefixes();
+        $this->assertArrayHasKey('Foo', $prefixes);
+        $this->assertArrayNotHasKey('Foo1', $prefixes);
+        $this->assertArrayHasKey('Bar', $prefixes);
+        $this->assertArrayHasKey('Bas', $prefixes);
+    }
+
+    /**
+     * @dataProvider getLoadClassFromFallbackTests
+     */
+    public function testLoadClassFromFallback($className, $testClassName, $message)
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerNamespace('Namespaced', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerPrefix('Pearlike_', __DIR__.\DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerNamespaceFallbacks(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/fallback'));
+        $loader->registerPrefixFallbacks(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/fallback'));
+        $this->assertTrue($loader->loadClass($testClassName));
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassFromFallbackTests()
+    {
+        return array(
+            array('\\Namespaced\\Baz',    'Namespaced\\Baz',    '->loadClass() loads Namespaced\Baz class'),
+            array('\\Pearlike_Baz',       'Pearlike_Baz',       '->loadClass() loads Pearlike_Baz class'),
+            array('\\Namespaced\\FooBar', 'Namespaced\\FooBar', '->loadClass() loads Namespaced\Baz class from fallback dir'),
+            array('\\Pearlike_FooBar',    'Pearlike_FooBar',    '->loadClass() loads Pearlike_Baz class from fallback dir'),
+        );
+    }
+
+    public function testRegisterPrefixFallback()
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerPrefixFallback(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/fallback');
+        $this->assertEquals(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/fallback'), $loader->getPrefixFallbacks());
+    }
+
+    public function testRegisterNamespaceFallback()
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerNamespaceFallback(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Namespaced/fallback');
+        $this->assertEquals(array(__DIR__.\DIRECTORY_SEPARATOR.'Fixtures/Namespaced/fallback'), $loader->getNamespaceFallbacks());
+    }
+
+    /**
+     * @dataProvider getLoadClassNamespaceCollisionTests
+     */
+    public function testLoadClassNamespaceCollision($namespaces, $className, $message)
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerNamespaces($namespaces);
+
+        $this->assertTrue($loader->loadClass($className));
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassNamespaceCollisionTests()
+    {
+        return array(
+            array(
+                array(
+                    'NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                ),
+                'NamespaceCollision\A\Foo',
+                '->loadClass() loads NamespaceCollision\A\Foo from alpha.',
+            ),
+            array(
+                array(
+                    'NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                ),
+                'NamespaceCollision\A\Bar',
+                '->loadClass() loads NamespaceCollision\A\Bar from alpha.',
+            ),
+            array(
+                array(
+                    'NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                ),
+                'NamespaceCollision\A\B\Foo',
+                '->loadClass() loads NamespaceCollision\A\B\Foo from beta.',
+            ),
+            array(
+                array(
+                    'NamespaceCollision\\A\\B' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'NamespaceCollision\\A' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                ),
+                'NamespaceCollision\A\B\Bar',
+                '->loadClass() loads NamespaceCollision\A\B\Bar from beta.',
+            ),
+        );
+    }
+
+    /**
+     * @dataProvider getLoadClassPrefixCollisionTests
+     */
+    public function testLoadClassPrefixCollision($prefixes, $className, $message)
+    {
+        $loader = new UniversalClassLoader();
+        $loader->registerPrefixes($prefixes);
+
+        $this->assertTrue($loader->loadClass($className));
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassPrefixCollisionTests()
+    {
+        return array(
+            array(
+                array(
+                    'PrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                ),
+                'PrefixCollision_A_Foo',
+                '->loadClass() loads PrefixCollision_A_Foo from alpha.',
+            ),
+            array(
+                array(
+                    'PrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                ),
+                'PrefixCollision_A_Bar',
+                '->loadClass() loads PrefixCollision_A_Bar from alpha.',
+            ),
+            array(
+                array(
+                    'PrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                    'PrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                ),
+                'PrefixCollision_A_B_Foo',
+                '->loadClass() loads PrefixCollision_A_B_Foo from beta.',
+            ),
+            array(
+                array(
+                    'PrefixCollision_A_B_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/beta',
+                    'PrefixCollision_A_' => __DIR__.\DIRECTORY_SEPARATOR.'Fixtures/alpha',
+                ),
+                'PrefixCollision_A_B_Bar',
+                '->loadClass() loads PrefixCollision_A_B_Bar from beta.',
+            ),
+        );
+    }
+}

Tests/Psr4ClassLoaderTest.php

@@ -14,9 +14,6 @@ namespace Symfony\Component\ClassLoader\Tests;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\Psr4ClassLoader;
 
-/**
- * @group legacy
- */
 class Psr4ClassLoaderTest extends TestCase
 {
     /**
@@ -28,7 +25,7 @@ class Psr4ClassLoaderTest extends TestCase
         $loader = new Psr4ClassLoader();
         $loader->addPrefix(
             'Acme\\DemoLib',
-            __DIR__.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR.'psr-4'
+            __DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.'psr-4'
         );
         $loader->loadClass($className);
         $this->assertTrue(class_exists($className), sprintf('loadClass() should load %s', $className));
@@ -56,7 +53,7 @@ class Psr4ClassLoaderTest extends TestCase
         $loader = new Psr4ClassLoader();
         $loader->addPrefix(
             'Acme\\DemoLib',
-            __DIR__.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR.'psr-4'
+            __DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR.'psr-4'
         );
         $loader->loadClass($className);
         $this->assertFalse(class_exists($className), sprintf('loadClass() should not load %s', $className));

UniversalClassLoader.php

@@ -0,0 +1,307 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader;
+
+@trigger_error('The '.__NAMESPACE__.'\UniversalClassLoader class is deprecated since Symfony 2.7 and will be removed in 3.0. Use the Symfony\Component\ClassLoader\ClassLoader class instead.', E_USER_DEPRECATED);
+
+/**
+ * UniversalClassLoader implements a "universal" autoloader for PHP 5.3.
+ *
+ * It is able to load classes that use either:
+ *
+ *  * The technical interoperability standards for PHP 5.3 namespaces and
+ *    class names (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md);
+ *
+ *  * The PEAR naming convention for classes (http://pear.php.net/).
+ *
+ * Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
+ * looked for in a list of locations to ease the vendoring of a sub-set of
+ * classes for large projects.
+ *
+ * Example usage:
+ *
+ *     $loader = new UniversalClassLoader();
+ *
+ *     // register classes with namespaces
+ *     $loader->registerNamespaces(array(
+ *         'Symfony\Component' => __DIR__.'/component',
+ *         'Symfony' => __DIR__.'/framework',
+ *         'Sensio' => array(__DIR__.'/src', __DIR__.'/vendor'),
+ *     ));
+ *
+ *     // register a library using the PEAR naming convention
+ *     $loader->registerPrefixes(array(
+ *         'Swift_' => __DIR__.'/Swift',
+ *     ));
+ *
+ *
+ *     // to enable searching the include path (e.g. for PEAR packages)
+ *     $loader->useIncludePath(true);
+ *
+ *     // activate the autoloader
+ *     $loader->register();
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link ClassLoader} class instead.
+ */
+class UniversalClassLoader
+{
+    private $namespaces = array();
+    private $prefixes = array();
+    private $namespaceFallbacks = array();
+    private $prefixFallbacks = array();
+    private $useIncludePath = false;
+
+    /**
+     * Turns on searching the include for class files. Allows easy loading
+     * of installed PEAR packages.
+     *
+     * @param bool $useIncludePath
+     */
+    public function useIncludePath($useIncludePath)
+    {
+        $this->useIncludePath = (bool) $useIncludePath;
+    }
+
+    /**
+     * Can be used to check if the autoloader uses the include path to check
+     * for classes.
+     *
+     * @return bool
+     */
+    public function getUseIncludePath()
+    {
+        return $this->useIncludePath;
+    }
+
+    /**
+     * Gets the configured namespaces.
+     *
+     * @return array A hash with namespaces as keys and directories as values
+     */
+    public function getNamespaces()
+    {
+        return $this->namespaces;
+    }
+
+    /**
+     * Gets the configured class prefixes.
+     *
+     * @return array A hash with class prefixes as keys and directories as values
+     */
+    public function getPrefixes()
+    {
+        return $this->prefixes;
+    }
+
+    /**
+     * Gets the directory(ies) to use as a fallback for namespaces.
+     *
+     * @return array An array of directories
+     */
+    public function getNamespaceFallbacks()
+    {
+        return $this->namespaceFallbacks;
+    }
+
+    /**
+     * Gets the directory(ies) to use as a fallback for class prefixes.
+     *
+     * @return array An array of directories
+     */
+    public function getPrefixFallbacks()
+    {
+        return $this->prefixFallbacks;
+    }
+
+    /**
+     * Registers the directory to use as a fallback for namespaces.
+     *
+     * @param array $dirs An array of directories
+     */
+    public function registerNamespaceFallbacks(array $dirs)
+    {
+        $this->namespaceFallbacks = $dirs;
+    }
+
+    /**
+     * Registers a directory to use as a fallback for namespaces.
+     *
+     * @param string $dir A directory
+     */
+    public function registerNamespaceFallback($dir)
+    {
+        $this->namespaceFallbacks[] = $dir;
+    }
+
+    /**
+     * Registers directories to use as a fallback for class prefixes.
+     *
+     * @param array $dirs An array of directories
+     */
+    public function registerPrefixFallbacks(array $dirs)
+    {
+        $this->prefixFallbacks = $dirs;
+    }
+
+    /**
+     * Registers a directory to use as a fallback for class prefixes.
+     *
+     * @param string $dir A directory
+     */
+    public function registerPrefixFallback($dir)
+    {
+        $this->prefixFallbacks[] = $dir;
+    }
+
+    /**
+     * Registers an array of namespaces.
+     *
+     * @param array $namespaces An array of namespaces (namespaces as keys and locations as values)
+     */
+    public function registerNamespaces(array $namespaces)
+    {
+        foreach ($namespaces as $namespace => $locations) {
+            $this->namespaces[$namespace] = (array) $locations;
+        }
+    }
+
+    /**
+     * Registers a namespace.
+     *
+     * @param string       $namespace The namespace
+     * @param array|string $paths     The location(s) of the namespace
+     */
+    public function registerNamespace($namespace, $paths)
+    {
+        $this->namespaces[$namespace] = (array) $paths;
+    }
+
+    /**
+     * Registers an array of classes using the PEAR naming convention.
+     *
+     * @param array $classes An array of classes (prefixes as keys and locations as values)
+     */
+    public function registerPrefixes(array $classes)
+    {
+        foreach ($classes as $prefix => $locations) {
+            $this->prefixes[$prefix] = (array) $locations;
+        }
+    }
+
+    /**
+     * Registers a set of classes using the PEAR naming convention.
+     *
+     * @param string       $prefix The classes prefix
+     * @param array|string $paths  The location(s) of the classes
+     */
+    public function registerPrefix($prefix, $paths)
+    {
+        $this->prefixes[$prefix] = (array) $paths;
+    }
+
+    /**
+     * Registers this instance as an autoloader.
+     *
+     * @param bool $prepend Whether to prepend the autoloader or not
+     */
+    public function register($prepend = false)
+    {
+        spl_autoload_register(array($this, 'loadClass'), true, $prepend);
+    }
+
+    /**
+     * Loads the given class or interface.
+     *
+     * @param string $class The name of the class
+     *
+     * @return bool|null True, if loaded
+     */
+    public function loadClass($class)
+    {
+        if ($file = $this->findFile($class)) {
+            require $file;
+
+            return true;
+        }
+    }
+
+    /**
+     * Finds the path to the file where the class is defined.
+     *
+     * @param string $class The name of the class
+     *
+     * @return string|null The path, if found
+     */
+    public function findFile($class)
+    {
+        if (false !== $pos = strrpos($class, '\\')) {
+            // namespaced class name
+            $namespace = substr($class, 0, $pos);
+            $className = substr($class, $pos + 1);
+            $normalizedClass = str_replace('\\', \DIRECTORY_SEPARATOR, $namespace).\DIRECTORY_SEPARATOR.str_replace('_', \DIRECTORY_SEPARATOR, $className).'.php';
+            foreach ($this->namespaces as $ns => $dirs) {
+                if (0 !== strpos($namespace, $ns)) {
+                    continue;
+                }
+
+                foreach ($dirs as $dir) {
+                    $file = $dir.\DIRECTORY_SEPARATOR.$normalizedClass;
+                    if (is_file($file)) {
+                        return $file;
+                    }
+                }
+            }
+
+            foreach ($this->namespaceFallbacks as $dir) {
+                $file = $dir.\DIRECTORY_SEPARATOR.$normalizedClass;
+                if (is_file($file)) {
+                    return $file;
+                }
+            }
+        } else {
+            // PEAR-like class name
+            $normalizedClass = str_replace('_', \DIRECTORY_SEPARATOR, $class).'.php';
+            foreach ($this->prefixes as $prefix => $dirs) {
+                if (0 !== strpos($class, $prefix)) {
+                    continue;
+                }
+
+                foreach ($dirs as $dir) {
+                    $file = $dir.\DIRECTORY_SEPARATOR.$normalizedClass;
+                    if (is_file($file)) {
+                        return $file;
+                    }
+                }
+            }
+
+            foreach ($this->prefixFallbacks as $dir) {
+                $file = $dir.\DIRECTORY_SEPARATOR.$normalizedClass;
+                if (is_file($file)) {
+                    return $file;
+                }
+            }
+        }
+
+        if ($this->useIncludePath && $file = stream_resolve_include_path($normalizedClass)) {
+            return $file;
+        }
+    }
+}

WinCacheClassLoader.php

@@ -11,17 +11,17 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\WinCacheClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.', E_USER_DEPRECATED);
-
 /**
  * WinCacheClassLoader implements a wrapping autoloader cached in WinCache.
  *
  * It expects an object implementing a findFile method to find the file. This
  * allow using it as a wrapper around the other loaders of the component (the
- * ClassLoader for instance) but also around any other autoloaders following
- * this convention (the Composer one for instance).
+ * ClassLoader and the UniversalClassLoader for instance) but also around any
+ * other autoloaders following this convention (the Composer one for instance).
  *
  *     // with a Symfony autoloader
+ *     use Symfony\Component\ClassLoader\ClassLoader;
+ *
  *     $loader = new ClassLoader();
  *     $loader->addPrefix('Symfony\Component', __DIR__.'/component');
  *     $loader->addPrefix('Symfony',           __DIR__.'/framework');
@@ -45,8 +45,6 @@ namespace Symfony\Component\ClassLoader;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
  * @author Artem Ryzhkov <artem@smart-core.org>
- *
- * @deprecated since version 3.3, to be removed in 4.0. Use `composer install --apcu-autoloader` instead.
  */
 class WinCacheClassLoader
 {
@@ -68,7 +66,7 @@ class WinCacheClassLoader
      */
     public function __construct($prefix, $decorated)
     {
-        if (!extension_loaded('wincache')) {
+        if (!\extension_loaded('wincache')) {
             throw new \RuntimeException('Unable to use WinCacheClassLoader as WinCache is not enabled.');
         }
 
@@ -137,6 +135,6 @@ class WinCacheClassLoader
      */
     public function __call($method, $args)
     {
-        return call_user_func_array(array($this->decorated, $method), $args);
+        return \call_user_func_array(array($this->decorated, $method), $args);
     }
 }

XcacheClassLoader.php

@@ -11,17 +11,17 @@
 
 namespace Symfony\Component\ClassLoader;
 
-@trigger_error('The '.__NAMESPACE__.'\XcacheClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.', E_USER_DEPRECATED);
-
 /**
  * XcacheClassLoader implements a wrapping autoloader cached in XCache for PHP 5.3.
  *
  * It expects an object implementing a findFile method to find the file. This
  * allows using it as a wrapper around the other loaders of the component (the
- * ClassLoader for instance) but also around any other autoloaders following
- * this convention (the Composer one for instance).
+ * ClassLoader and the UniversalClassLoader for instance) but also around any
+ * other autoloaders following this convention (the Composer one for instance).
  *
  *     // with a Symfony autoloader
+ *     use Symfony\Component\ClassLoader\ClassLoader;
+ *
  *     $loader = new ClassLoader();
  *     $loader->addPrefix('Symfony\Component', __DIR__.'/component');
  *     $loader->addPrefix('Symfony',           __DIR__.'/framework');
@@ -45,8 +45,6 @@ namespace Symfony\Component\ClassLoader;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
  * @author Kim Hemsø Rasmussen <kimhemsoe@gmail.com>
- *
- * @deprecated since version 3.3, to be removed in 4.0. Use `composer install --apcu-autoloader` instead.
  */
 class XcacheClassLoader
 {
@@ -62,7 +60,7 @@ class XcacheClassLoader
      */
     public function __construct($prefix, $decorated)
     {
-        if (!extension_loaded('xcache')) {
+        if (!\extension_loaded('xcache')) {
             throw new \RuntimeException('Unable to use XcacheClassLoader as XCache is not enabled.');
         }
 
@@ -132,6 +130,6 @@ class XcacheClassLoader
      */
     public function __call($method, $args)
     {
-        return call_user_func_array(array($this->decorated, $method), $args);
+        return \call_user_func_array(array($this->decorated, $method), $args);
     }
 }

composer.json

@@ -17,14 +17,11 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": "^5.5.9|>=7.0.8"
-    },
-    "require-dev": {
-        "symfony/finder": "~2.8|~3.0",
+        "php": ">=5.3.9",
         "symfony/polyfill-apcu": "~1.1"
     },
-    "suggest": {
-        "symfony/polyfill-apcu": "For using ApcClassLoader on HHVM"
+    "require-dev": {
+        "symfony/finder": "^2.0.5|~3.0.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\ClassLoader\\": "" },
@@ -34,7 +31,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "3.3-dev"
+            "dev-master": "2.8-dev"
         }
     }
 }

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/5.2/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php"