fixed years in copyright

This PR was squashed before being merged into the 2.7 branch (closes #24342).

Discussion
----------

removed useless PHPDoc

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        | n/a

Commits
-------

5ee9043d8b removed useless PHPDoc

ApcClassLoader.php

@@ -44,8 +44,6 @@ namespace Symfony\Component\ClassLoader;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
- *
- * @api
  */
 class ApcClassLoader
 {
@@ -59,20 +57,16 @@ class ApcClassLoader
     protected $decorated;
 
     /**
-     * Constructor.
-     *
-     * @param string $prefix    The APC namespace prefix to use.
-     * @param object $decorated A class loader object that implements the findFile() method.
+     * @param string $prefix    The APC namespace prefix to use
+     * @param object $decorated A class loader object that implements the findFile() method
      *
      * @throws \RuntimeException
      * @throws \InvalidArgumentException
-     *
-     * @api
      */
     public function __construct($prefix, $decorated)
     {
-        if (!extension_loaded('apc')) {
-            throw new \RuntimeException('Unable to use ApcClassLoader as APC is not enabled.');
+        if (!function_exists('apcu_fetch')) {
+            throw new \RuntimeException('Unable to use ApcClassLoader as APC is not installed.');
         }
 
         if (!method_exists($decorated, 'findFile')) {
@@ -126,8 +120,10 @@ class ApcClassLoader
      */
     public function findFile($class)
     {
-        if (false === $file = apc_fetch($this->prefix.$class)) {
-            apc_store($this->prefix.$class, $file = $this->decorated->findFile($class));
+        $file = apcu_fetch($this->prefix.$class, $success);
+
+        if (!$success) {
+            apcu_store($this->prefix.$class, $file = $this->decorated->findFile($class) ?: null);
         }
 
         return $file;

ApcUniversalClassLoader.php

@@ -11,6 +11,8 @@
 
 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.
  *
@@ -58,26 +60,21 @@ namespace Symfony\Component\ClassLoader;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
  *
- * @api
- *
- * @deprecated Deprecated since version 2.4, to be removed in 3.0. Use the ApcClassLoader class instead.
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link ClassLoader} class instead.
  */
 class ApcUniversalClassLoader extends UniversalClassLoader
 {
     private $prefix;
 
     /**
-     * Constructor.
-     *
      * @param string $prefix A prefix to create a namespace in APC
      *
      * @throws \RuntimeException
-     *
-     * @api
      */
     public function __construct($prefix)
     {
-        if (!extension_loaded('apc')) {
+        if (!function_exists('apcu_fetch')) {
             throw new \RuntimeException('Unable to use ApcUniversalClassLoader as APC is not enabled.');
         }
 
@@ -93,8 +90,10 @@ class ApcUniversalClassLoader extends UniversalClassLoader
      */
     public function findFile($class)
     {
-        if (false === $file = apc_fetch($this->prefix.$class)) {
-            apc_store($this->prefix.$class, $file = parent::findFile($class));
+        $file = apcu_fetch($this->prefix.$class, $success);
+
+        if (!$success) {
+            apcu_store($this->prefix.$class, $file = parent::findFile($class) ?: null);
         }
 
         return $file;

ClassCollectionLoader.php

@@ -43,12 +43,12 @@ class ClassCollectionLoader
 
         self::$loaded[$name] = true;
 
-        $declared = array_merge(get_declared_classes(), get_declared_interfaces());
-        if (function_exists('get_declared_traits')) {
-            $declared = array_merge($declared, get_declared_traits());
-        }
-
         if ($adaptive) {
+            $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);
 
@@ -58,6 +58,11 @@ class ClassCollectionLoader
 
         $classes = array_unique($classes);
 
+        // cache the core classes
+        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);
         $cache = $cacheDir.'/'.$name.$extension;
 
         // auto-reload
@@ -87,12 +92,29 @@ class ClassCollectionLoader
             }
         }
 
-        if (!$reload && is_file($cache)) {
+        if (!$reload && file_exists($cache)) {
             require_once $cache;
 
             return;
         }
+        if (!$adaptive) {
+            $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|/\*(?:(?<!\*/).)++)?+)*+';
+        $dontInlineRegex = <<<REGEX
+            '(?:
+               ^<\?php\s.declare.\(.strict_types.=.1.\).;
+               | \b__halt_compiler.\(.\)
+               | \b__(?:DIR|FILE)__\b
+            )'isx
+REGEX;
+        $dontInlineRegex = str_replace('.', $spacesRegex, $dontInlineRegex);
+
+        $cacheDir = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $cacheDir));
         $files = array();
         $content = '';
         foreach (self::getOrderedClasses($classes) as $class) {
@@ -100,25 +122,40 @@ class ClassCollectionLoader
                 continue;
             }
 
-            $files[] = $class->getFileName();
+            $files[] = $file = $class->getFileName();
+            $c = file_get_contents($file);
 
-            $c = preg_replace(array('/^\s*<\?php/', '/\?>\s*$/'), '', file_get_contents($class->getFileName()));
+            if (preg_match($dontInlineRegex, $c)) {
+                $file = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $file));
 
-            // fakes namespace declaration for global code
-            if (!$class->inNamespace()) {
-                $c = "\nnamespace\n{\n".$c."\n}\n";
+                for ($i = 0; isset($file[$i], $cacheDir[$i]); ++$i) {
+                    if ($file[$i] !== $cacheDir[$i]) {
+                        break;
+                    }
+                }
+                if (1 >= $i) {
+                    $file = var_export(implode('/', $file), true);
+                } else {
+                    $file = array_slice($file, $i);
+                    $file = str_repeat('../', count($cacheDir) - $i).implode('/', $file);
+                    $file = '__DIR__.'.var_export('/'.$file, true);
+                }
+
+                $c = "\nnamespace {require $file;}";
+            } else {
+                $c = preg_replace(array('/^\s*<\?php/', '/\?>\s*$/'), '', $c);
+
+                // fakes namespace declaration for global code
+                if (!$class->inNamespace()) {
+                    $c = "\nnamespace\n{\n".$c."\n}\n";
+                }
+
+                $c = self::fixNamespaceDeclarations('<?php '.$c);
+                $c = preg_replace('/^\s*<\?php/', '', $c);
             }
 
-            $c = self::fixNamespaceDeclarations('<?php '.$c);
-            $c = preg_replace('/^\s*<\?php/', '', $c);
-
             $content .= $c;
         }
-
-        // cache the core classes
-        if (!is_dir(dirname($cache))) {
-            mkdir(dirname($cache), 0777, true);
-        }
         self::writeCacheFile($cache, '<?php '.$content);
 
         if ($autoReload) {
@@ -137,8 +174,8 @@ class ClassCollectionLoader
     public static function fixNamespaceDeclarations($source)
     {
         if (!function_exists('token_get_all') || !self::$useTokenizer) {
-            if (preg_match('/namespace(.*?)\s*;/', $source)) {
-                $source = preg_replace('/namespace(.*?)\s*;/', "namespace$1\n{", $source)."}\n";
+            if (preg_match('/(^|\s)namespace(.*?)\s*;/', $source)) {
+                $source = preg_replace('/(^|\s)namespace(.*?)\s*;/', "$1namespace$2\n{", $source)."}\n";
             }
 
             return $source;
@@ -149,8 +186,9 @@ class ClassCollectionLoader
         $inNamespace = false;
         $tokens = token_get_all($source);
 
-        for (reset($tokens); false !== $token = current($tokens); next($tokens)) {
-            if (is_string($token)) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
+            $token = $tokens[$i];
+            if (!isset($token[1]) || 'b"' === $token) {
                 $rawChunk .= $token;
             } elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
                 // strip comments
@@ -162,12 +200,12 @@ class ClassCollectionLoader
                 $rawChunk .= $token[1];
 
                 // namespace name and whitespaces
-                while (($t = next($tokens)) && is_array($t) && in_array($t[0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
-                    $rawChunk .= $t[1];
+                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
+                    $rawChunk .= $tokens[$i][1];
                 }
-                if ('{' === $t) {
+                if ('{' === $tokens[$i]) {
                     $inNamespace = false;
-                    prev($tokens);
+                    --$i;
                 } else {
                     $rawChunk = rtrim($rawChunk)."\n{";
                     $inNamespace = true;
@@ -175,9 +213,9 @@ class ClassCollectionLoader
             } elseif (T_START_HEREDOC === $token[0]) {
                 $output .= self::compressCode($rawChunk).$token[1];
                 do {
-                    $token = next($tokens);
-                    $output .= is_string($token) ? $token : $token[1];
-                } while ($token[0] !== T_END_HEREDOC);
+                    $token = $tokens[++$i];
+                    $output .= isset($token[1]) && 'b"' !== $token ? $token[1] : $token;
+                } while (T_END_HEREDOC !== $token[0]);
                 $output .= "\n";
                 $rawChunk = '';
             } elseif (T_CONSTANT_ENCAPSED_STRING === $token[0]) {
@@ -192,7 +230,15 @@ class ClassCollectionLoader
             $rawChunk .= "}\n";
         }
 
-        return $output.self::compressCode($rawChunk);
+        $output .= self::compressCode($rawChunk);
+
+        if (\PHP_VERSION_ID >= 70000) {
+            // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+            unset($tokens, $rawChunk);
+            gc_mem_caches();
+        }
+
+        return $output;
     }
 
     /**
@@ -229,7 +275,13 @@ class ClassCollectionLoader
      */
     private static function writeCacheFile($file, $content)
     {
-        $tmpFile = tempnam(dirname($file), basename($file));
+        $dir = dirname($file);
+        if (!is_writable($dir)) {
+            throw new \RuntimeException(sprintf('Cache directory "%s" is not writable.', $dir));
+        }
+
+        $tmpFile = tempnam($dir, basename($file));
+
         if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
             @chmod($file, 0666 & ~umask());
 
@@ -242,8 +294,6 @@ class ClassCollectionLoader
     /**
      * Gets an ordered array of passed classes including all their dependencies.
      *
-     * @param array $classes
-     *
      * @return \ReflectionClass[] An array of sorted \ReflectionClass instances (dependencies added if needed)
      *
      * @throws \InvalidArgumentException When a class can't be loaded
@@ -283,7 +333,7 @@ class ClassCollectionLoader
 
         $traits = array();
 
-        if (function_exists('get_declared_traits')) {
+        if (method_exists('ReflectionClass', 'getTraits')) {
             foreach ($classes as $c) {
                 foreach (self::resolveDependencies(self::computeTraitDeps($c), $c) as $trait) {
                     if ($trait !== $c) {

ClassLoader.php

@@ -91,12 +91,16 @@ class ClassLoader
             return;
         }
         if (isset($this->prefixes[$prefix])) {
-            $this->prefixes[$prefix] = array_merge(
-                $this->prefixes[$prefix],
-                (array) $paths
-            );
+            if (is_array($paths)) {
+                $this->prefixes[$prefix] = array_unique(array_merge(
+                    $this->prefixes[$prefix],
+                    $paths
+                ));
+            } elseif (!in_array($paths, $this->prefixes[$prefix])) {
+                $this->prefixes[$prefix][] = $paths;
+            }
         } else {
-            $this->prefixes[$prefix] = (array) $paths;
+            $this->prefixes[$prefix] = array_unique((array) $paths);
         }
     }
 

ClassMapGenerator.php

@@ -12,7 +12,7 @@
 namespace Symfony\Component\ClassLoader;
 
 if (!defined('SYMFONY_TRAIT')) {
-    if (PHP_VERSION_ID >= 50400) {
+    if (\PHP_VERSION_ID >= 50400) {
         define('SYMFONY_TRAIT', T_TRAIT);
     } else {
         define('SYMFONY_TRAIT', 0);
@@ -64,14 +64,19 @@ class ClassMapGenerator
                 continue;
             }
 
-            $path = $file->getRealPath();
+            $path = $file->getRealPath() ?: $file->getPathname();
 
-            if (pathinfo($path, PATHINFO_EXTENSION) !== 'php') {
+            if ('php' !== pathinfo($path, PATHINFO_EXTENSION)) {
                 continue;
             }
 
             $classes = self::findClasses($path);
 
+            if (\PHP_VERSION_ID >= 70000) {
+                // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+                gc_mem_caches();
+            }
+
             foreach ($classes as $class) {
                 $map[$class] = $path;
             }
@@ -95,10 +100,10 @@ class ClassMapGenerator
         $classes = array();
 
         $namespace = '';
-        for ($i = 0, $max = count($tokens); $i < $max; $i++) {
+        for ($i = 0; isset($tokens[$i]); ++$i) {
             $token = $tokens[$i];
 
-            if (is_string($token)) {
+            if (!isset($token[1])) {
                 continue;
             }
 
@@ -108,9 +113,9 @@ class ClassMapGenerator
                 case T_NAMESPACE:
                     $namespace = '';
                     // If there is a namespace, extract it
-                    while (($t = $tokens[++$i]) && is_array($t)) {
-                        if (in_array($t[0], array(T_STRING, T_NS_SEPARATOR))) {
-                            $namespace .= $t[1];
+                    while (isset($tokens[++$i][1])) {
+                        if (in_array($tokens[$i][0], array(T_STRING, T_NS_SEPARATOR))) {
+                            $namespace .= $tokens[$i][1];
                         }
                     }
                     $namespace .= '\\';
@@ -118,11 +123,31 @@ class ClassMapGenerator
                 case T_CLASS:
                 case T_INTERFACE:
                 case SYMFONY_TRAIT:
+                    // Skip usage of ::class constant
+                    $isClassConstant = false;
+                    for ($j = $i - 1; $j > 0; --$j) {
+                        if (!isset($tokens[$j][1])) {
+                            break;
+                        }
+
+                        if (T_DOUBLE_COLON === $tokens[$j][0]) {
+                            $isClassConstant = true;
+                            break;
+                        } elseif (!in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
+                            break;
+                        }
+                    }
+
+                    if ($isClassConstant) {
+                        break;
+                    }
+
                     // Find the classname
-                    while (($t = $tokens[++$i]) && is_array($t)) {
+                    while (isset($tokens[++$i][1])) {
+                        $t = $tokens[$i];
                         if (T_STRING === $t[0]) {
                             $class .= $t[1];
-                        } elseif ($class !== '' && T_WHITESPACE == $t[0]) {
+                        } elseif ('' !== $class && T_WHITESPACE === $t[0]) {
                             break;
                         }
                     }

DebugClassLoader.php

@@ -11,6 +11,8 @@
 
 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.
  *
@@ -21,20 +23,15 @@ namespace Symfony\Component\ClassLoader;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Christophe Coevoet <stof@notk.org>
  *
- * @api
- *
- * @deprecated Deprecated since version 2.4, to be removed in 3.0. Use the DebugClassLoader provided by the Debug component instead.
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use {@link \Symfony\Component\Debug\DebugClassLoader} instead.
  */
 class DebugClassLoader
 {
     private $classFinder;
 
     /**
-     * Constructor.
-     *
      * @param object $classFinder
-     *
-     * @api
      */
     public function __construct($classFinder)
     {
@@ -90,7 +87,7 @@ class DebugClassLoader
      */
     public function findFile($class)
     {
-        return $this->classFinder->findFile($class);
+        return $this->classFinder->findFile($class) ?: null;
     }
 
     /**

DebugUniversalClassLoader.php

@@ -11,12 +11,15 @@
 
 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 Deprecated since version 2.4, to be removed in 3.0. Use the DebugClassLoader provided by the Debug component instead.
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link \Symfony\Component\Debug\DebugClassLoader} class instead.
  */
 class DebugUniversalClassLoader extends UniversalClassLoader
 {

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2015 Fabien Potencier
+Copyright (c) 2004-2018 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

MapClassLoader.php

@@ -21,8 +21,6 @@ class MapClassLoader
     private $map = array();
 
     /**
-     * Constructor.
-     *
      * @param array $map A map where keys are classes and values the absolute file path
      */
     public function __construct(array $map)

Psr4ClassLoader.php

@@ -20,9 +20,6 @@ namespace Symfony\Component\ClassLoader;
  */
 class Psr4ClassLoader
 {
-    /**
-     * @var array
-     */
     private $prefixes = array();
 
     /**

README.md

@@ -1,85 +1,14 @@
 ClassLoader Component
 =====================
 
-ClassLoader loads your project classes automatically if they follow some
-standard PHP conventions.
-
-The ClassLoader object is able to autoload classes that implement the PSR-0
-standard or the PEAR naming convention.
-
-First, register the autoloader:
-
-```php
-require_once __DIR__.'/src/Symfony/Component/ClassLoader/ClassLoader.php';
-
-use Symfony\Component\ClassLoader\ClassLoader;
-
-$loader = new ClassLoader();
-$loader->register();
-```
-
-Then, register some namespaces with the `addPrefix()` method:
-
-```php
-$loader->addPrefix('Symfony', __DIR__.'/src');
-$loader->addPrefix('Monolog', __DIR__.'/vendor/monolog/src');
-```
-
-The `addPrefix()` method takes a namespace prefix and a path where to
-look for the classes as arguments.
-
-You can also register a sub-namespaces:
-
-```php
-$loader->addPrefix('Doctrine\\Common', __DIR__.'/vendor/doctrine-common/lib');
-```
-
-The order of registration is significant and the first registered namespace
-takes precedence over later registered one.
-
-You can also register more than one path for a given namespace:
-
-```php
-$loader->addPrefix('Symfony', array(__DIR__.'/src', __DIR__.'/symfony/src'));
-```
-
-Alternatively, you can use the `addPrefixes()` method to register more
-than one namespace at once:
-
-```php
-$loader->addPrefixes(array(
-    'Symfony' => array(__DIR__.'/src', __DIR__.'/symfony/src'),
-    'Doctrine\\Common' => __DIR__.'/vendor/doctrine-common/lib',
-    'Doctrine' => __DIR__.'/vendor/doctrine/lib',
-    'Monolog' => __DIR__.'/vendor/monolog/src',
-));
-```
-
-For better performance, you can use the APC class loader:
-
-```php
-require_once __DIR__.'/src/Symfony/Component/ClassLoader/ClassLoader.php';
-require_once __DIR__.'/src/Symfony/Component/ClassLoader/ApcClassLoader.php';
-
-use Symfony\Component\ClassLoader\ClassLoader;
-use Symfony\Component\ClassLoader\ApcClassLoader;
-
-$loader = new ClassLoader();
-$loader->addPrefix('Symfony', __DIR__.'/src');
-
-$loader = new ApcClassLoader('apc.prefix.', $loader);
-$loader->register();
-```
-
-Furthermore, the component provides tools to aggregate classes into a single
-file, which is especially useful to improve performance on servers that do not
-provide byte caches.
+The ClassLoader component provides tools to autoload your classes and cache
+their locations for performance.
 
 Resources
 ---------
 
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/ClassLoader/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/class_loader/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)

Tests/ApcClassLoaderTest.php

@@ -0,0 +1,197 @@
+<?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\ApcClassLoader;
+use Symfony\Component\ClassLoader\ClassLoader;
+
+class ApcClassLoaderTest extends TestCase
+{
+    protected function setUp()
+    {
+        if (!(ini_get('apc.enabled') && ini_get('apc.enable_cli'))) {
+            $this->markTestSkipped('The apc extension is not enabled.');
+        } else {
+            apcu_clear_cache();
+        }
+    }
+
+    protected function tearDown()
+    {
+        if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+            apcu_clear_cache();
+        }
+    }
+
+    public function testConstructor()
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefix('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+
+        $loader = new ApcClassLoader('test.prefix.', $loader);
+
+        $this->assertEquals($loader->findFile('\Apc\Namespaced\FooBar'), apcu_fetch('test.prefix.\Apc\Namespaced\FooBar'), '__construct() takes a prefix as its first argument');
+    }
+
+    /**
+     * @dataProvider getLoadClassTests
+     */
+    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 = new ApcClassLoader('test.prefix.', $loader);
+        $loader->loadClass($testClassName);
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassTests()
+    {
+        return array(
+           array('\\Apc\\Namespaced\\Foo', 'Apc\\Namespaced\\Foo',   '->loadClass() loads Apc\Namespaced\Foo class'),
+           array('Apc_Pearlike_Foo',    'Apc_Pearlike_Foo',      '->loadClass() loads Apc_Pearlike_Foo class'),
+        );
+    }
+
+    /**
+     * @dataProvider getLoadClassFromFallbackTests
+     */
+    public function testLoadClassFromFallback($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 = new ApcClassLoader('test.prefix.fallback', $loader);
+        $loader->loadClass($testClassName);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassFromFallbackTests()
+    {
+        return array(
+           array('\\Apc\\Namespaced\\Baz',    'Apc\\Namespaced\\Baz',    '->loadClass() loads Apc\Namespaced\Baz class'),
+           array('Apc_Pearlike_Baz',       'Apc_Pearlike_Baz',       '->loadClass() loads Apc_Pearlike_Baz class'),
+           array('\\Apc\\Namespaced\\FooBar', 'Apc\\Namespaced\\FooBar', '->loadClass() loads Apc\Namespaced\Baz class from fallback dir'),
+           array('Apc_Pearlike_FooBar',    'Apc_Pearlike_FooBar',    '->loadClass() loads Apc_Pearlike_Baz class from fallback dir'),
+       );
+    }
+
+    /**
+     * @dataProvider getLoadClassNamespaceCollisionTests
+     */
+    public function testLoadClassNamespaceCollision($namespaces, $className, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefixes($namespaces);
+
+        $loader = new ApcClassLoader('test.prefix.collision.', $loader);
+        $loader->loadClass($className);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassNamespaceCollisionTests()
+    {
+        return array(
+           array(
+               array(
+                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+               ),
+               'Apc\NamespaceCollision\A\Foo',
+               '->loadClass() loads NamespaceCollision\A\Foo from alpha.',
+           ),
+           array(
+               array(
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+               ),
+               'Apc\NamespaceCollision\A\Bar',
+               '->loadClass() loads NamespaceCollision\A\Bar from alpha.',
+           ),
+           array(
+               array(
+                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+               ),
+               'Apc\NamespaceCollision\A\B\Foo',
+               '->loadClass() loads NamespaceCollision\A\B\Foo from beta.',
+           ),
+           array(
+               array(
+                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
+               ),
+               'Apc\NamespaceCollision\A\B\Bar',
+               '->loadClass() loads NamespaceCollision\A\B\Bar from beta.',
+           ),
+        );
+    }
+
+    /**
+     * @dataProvider getLoadClassPrefixCollisionTests
+     */
+    public function testLoadClassPrefixCollision($prefixes, $className, $message)
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefixes($prefixes);
+
+        $loader = new ApcClassLoader('test.prefix.collision.', $loader);
+        $loader->loadClass($className);
+
+        $this->assertTrue(class_exists($className), $message);
+    }
+
+    public function getLoadClassPrefixCollisionTests()
+    {
+        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_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_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_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_Bar',
+               '->loadClass() loads ApcPrefixCollision_A_B_Bar from beta.',
+           ),
+        );
+    }
+}

Tests/ClassCollectionLoaderTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassCollectionLoader;
 
 require_once __DIR__.'/Fixtures/ClassesWithParents/GInterface.php';
@@ -18,30 +19,27 @@ require_once __DIR__.'/Fixtures/ClassesWithParents/CInterface.php';
 require_once __DIR__.'/Fixtures/ClassesWithParents/B.php';
 require_once __DIR__.'/Fixtures/ClassesWithParents/A.php';
 
-class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
+class ClassCollectionLoaderTest extends TestCase
 {
+    /**
+     * @requires PHP 5.4
+     */
     public function testTraitDependencies()
     {
-        if (PHP_VERSION_ID < 50400) {
-            $this->markTestSkipped('Requires PHP > 5.4');
-
-            return;
-        }
-
         require_once __DIR__.'/Fixtures/deps/traits.php';
 
         $r = new \ReflectionClass('Symfony\Component\ClassLoader\ClassCollectionLoader');
         $m = $r->getMethod('getOrderedClasses');
         $m->setAccessible(true);
 
-        $ordered = $m->invoke('Symfony\Component\ClassLoader\ClassCollectionLoader', array('CTFoo'));
+        $ordered = $m->invoke(null, array('CTFoo'));
 
         $this->assertEquals(
             array('TD', 'TC', 'TB', 'TA', 'TZ', 'CTFoo'),
             array_map(function ($class) { return $class->getName(); }, $ordered)
         );
 
-        $ordered = $m->invoke('Symfony\Component\ClassLoader\ClassCollectionLoader', array('CTBar'));
+        $ordered = $m->invoke(null, array('CTBar'));
 
         $this->assertEquals(
             array('TD', 'TZ', 'TC', 'TB', 'TA', 'CTBar'),
@@ -65,7 +63,7 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
         $m = $r->getMethod('getOrderedClasses');
         $m->setAccessible(true);
 
-        $ordered = $m->invoke('Symfony\Component\ClassLoader\ClassCollectionLoader', $classes);
+        $ordered = $m->invoke(null, $classes);
 
         $this->assertEquals($expected, array_map(function ($class) { return $class->getName(); }, $ordered));
     }
@@ -97,15 +95,10 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
 
     /**
      * @dataProvider getDifferentOrdersForTraits
+     * @requires PHP 5.4
      */
     public function testClassWithTraitsReordering(array $classes)
     {
-        if (PHP_VERSION_ID < 50400) {
-            $this->markTestSkipped('Requires PHP > 5.4');
-
-            return;
-        }
-
         require_once __DIR__.'/Fixtures/ClassesWithParents/ATrait.php';
         require_once __DIR__.'/Fixtures/ClassesWithParents/BTrait.php';
         require_once __DIR__.'/Fixtures/ClassesWithParents/CTrait.php';
@@ -128,7 +121,7 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
         $m = $r->getMethod('getOrderedClasses');
         $m->setAccessible(true);
 
-        $ordered = $m->invoke('Symfony\Component\ClassLoader\ClassCollectionLoader', $classes);
+        $ordered = $m->invoke(null, $classes);
 
         $this->assertEquals($expected, array_map(function ($class) { return $class->getName(); }, $ordered));
     }
@@ -146,14 +139,11 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    /**
+     * @requires PHP 5.4
+     */
     public function testFixClassWithTraitsOrdering()
     {
-        if (PHP_VERSION_ID < 50400) {
-            $this->markTestSkipped('Requires PHP > 5.4');
-
-            return;
-        }
-
         require_once __DIR__.'/Fixtures/ClassesWithParents/CTrait.php';
         require_once __DIR__.'/Fixtures/ClassesWithParents/F.php';
         require_once __DIR__.'/Fixtures/ClassesWithParents/G.php';
@@ -173,7 +163,7 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
         $m = $r->getMethod('getOrderedClasses');
         $m->setAccessible(true);
 
-        $ordered = $m->invoke('Symfony\Component\ClassLoader\ClassCollectionLoader', $classes);
+        $ordered = $m->invoke(null, $classes);
 
         $this->assertEquals($expected, array_map(function ($class) { return $class->getName(); }, $ordered));
     }
@@ -216,7 +206,7 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
             array("namespace   Bar ;\nclass Foo {}\n", "namespace   Bar\n{\nclass Foo {}\n}\n"),
             array("namespace Foo\Bar;\nclass Foo {}\n", "namespace Foo\Bar\n{\nclass Foo {}\n}\n"),
             array("namespace Foo\Bar\Bar\n{\nclass Foo {}\n}\n", "namespace Foo\Bar\Bar\n{\nclass Foo {}\n}\n"),
-            array("namespace\n{\nclass Foo {}\n}\n", "namespace\n{\nclass Foo {}\n}\n"),
+            array("\nnamespace\n{\nclass Foo {}\n\$namespace=123;}\n", "\nnamespace\n{\nclass Foo {}\n\$namespace=123;}\n"),
         );
     }
 
@@ -234,44 +224,46 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
 
     public function testCommentStripping()
     {
-        if (is_file($file = sys_get_temp_dir().'/bar.php')) {
+        if (is_file($file = __DIR__.'/bar.php')) {
             unlink($file);
         }
         spl_autoload_register($r = function ($class) {
             if (0 === strpos($class, 'Namespaced') || 0 === strpos($class, 'Pearlike_')) {
-                require_once __DIR__.'/Fixtures/'.str_replace(array('\\', '_'), '/', $class).'.php';
+                @require_once __DIR__.'/Fixtures/'.str_replace(array('\\', '_'), '/', $class).'.php';
             }
         });
 
+        $strictTypes = defined('HHVM_VERSION') ? '' : "\nnamespace {require __DIR__.'/Fixtures/Namespaced/WithStrictTypes.php';}";
+
         ClassCollectionLoader::load(
-            array('Namespaced\\WithComments', 'Pearlike_WithComments'),
-            sys_get_temp_dir(),
+            array('Namespaced\\WithComments', 'Pearlike_WithComments', 'Namespaced\\WithDirMagic', 'Namespaced\\WithFileMagic', 'Namespaced\\WithHaltCompiler', $strictTypes ? 'Namespaced\\WithStrictTypes' : 'Namespaced\\WithComments'),
+            __DIR__,
             'bar',
             false
         );
 
         spl_autoload_unregister($r);
 
-        $this->assertEquals(<<<EOF
+        $this->assertEquals(<<<'EOF'
 namespace Namespaced
 {
 class WithComments
 {
-public static \$loaded = true;
+public static $loaded = true;
 }
-\$string ='string should not be   modified {\$string}';
-\$heredoc = (<<<HD
+$string ='string should not be   modified {$string}';
+$heredoc = (<<<HD
 
 
-Heredoc should not be   modified {\$string}
+Heredoc should not be   modified {$string}
 
 
 HD
 );
-\$nowdoc =<<<'ND'
+$nowdoc =<<<'ND'
 
 
-Nowdoc should not be   modified {\$string}
+Nowdoc should not be   modified {$string}
 
 
 ND
@@ -281,11 +273,16 @@ namespace
 {
 class Pearlike_WithComments
 {
-public static \$loaded = true;
+public static $loaded = true;
 }
 }
+namespace {require __DIR__.'/Fixtures/Namespaced/WithDirMagic.php';}
+namespace {require __DIR__.'/Fixtures/Namespaced/WithFileMagic.php';}
+namespace {require __DIR__.'/Fixtures/Namespaced/WithHaltCompiler.php';}
 EOF
-        , str_replace("<?php \n", '', file_get_contents($file)));
+            .$strictTypes,
+            str_replace(array("<?php \n", '\\\\'), array('', '/'), file_get_contents($file))
+        );
 
         unlink($file);
     }

Tests/ClassLoaderTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassLoader;
 
-class ClassLoaderTest extends \PHPUnit_Framework_TestCase
+class ClassLoaderTest extends TestCase
 {
     public function testGetPrefixes()
     {
@@ -76,14 +77,36 @@ class ClassLoaderTest extends \PHPUnit_Framework_TestCase
         );
     }
 
-    public function testAddPrefix()
+    public function testAddPrefixSingle()
     {
         $loader = new ClassLoader();
         $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']);
+    }
+
+    public function testAddPrefixesSingle()
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefixes(array('Foo' => array('foo', 'foo')));
+        $loader->addPrefixes(array('Foo' => array('foo')));
+        $prefixes = $loader->getPrefixes();
+        $this->assertArrayHasKey('Foo', $prefixes);
+        $this->assertCount(1, $prefixes['Foo'], print_r($prefixes, true));
+    }
+
+    public function testAddPrefixMulti()
+    {
+        $loader = new ClassLoader();
+        $loader->addPrefix('Foo', 'foo');
+        $loader->addPrefix('Foo', 'bar');
+        $prefixes = $loader->getPrefixes();
+        $this->assertArrayHasKey('Foo', $prefixes);
         $this->assertCount(2, $prefixes['Foo']);
+        $this->assertContains('foo', $prefixes['Foo']);
+        $this->assertContains('bar', $prefixes['Foo']);
     }
 
     public function testUseIncludePath()

Tests/ClassMapGeneratorTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ClassMapGenerator;
 
-class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
+class ClassMapGeneratorTest extends TestCase
 {
     /**
      * @var string|null
@@ -22,7 +23,7 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
 
     public function prepare_workspace()
     {
-        $this->workspace = rtrim(sys_get_temp_dir(), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR.time().rand(0, 1000);
+        $this->workspace = sys_get_temp_dir().'/'.microtime(true).'.'.mt_rand();
         mkdir($this->workspace, 0777, true);
         $this->workspace = realpath($this->workspace);
     }
@@ -47,7 +48,7 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
     /**
      * @dataProvider getTestCreateMapTests
      */
-    public function testDump($directory, $expected)
+    public function testDump($directory)
     {
         $this->prepare_workspace();
 
@@ -76,8 +77,11 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
                 'Namespaced\\Foo' => realpath(__DIR__).'/Fixtures/Namespaced/Foo.php',
                 'Namespaced\\Baz' => realpath(__DIR__).'/Fixtures/Namespaced/Baz.php',
                 'Namespaced\\WithComments' => realpath(__DIR__).'/Fixtures/Namespaced/WithComments.php',
-                ),
-            ),
+                'Namespaced\\WithStrictTypes' => realpath(__DIR__).'/Fixtures/Namespaced/WithStrictTypes.php',
+                'Namespaced\\WithHaltCompiler' => realpath(__DIR__).'/Fixtures/Namespaced/WithHaltCompiler.php',
+                'Namespaced\\WithDirMagic' => realpath(__DIR__).'/Fixtures/Namespaced/WithDirMagic.php',
+                'Namespaced\\WithFileMagic' => realpath(__DIR__).'/Fixtures/Namespaced/WithFileMagic.php',
+            )),
             array(__DIR__.'/Fixtures/beta/NamespaceCollision', array(
                 'NamespaceCollision\\A\\B\\Bar' => realpath(__DIR__).'/Fixtures/beta/NamespaceCollision/A/B/Bar.php',
                 'NamespaceCollision\\A\\B\\Foo' => realpath(__DIR__).'/Fixtures/beta/NamespaceCollision/A/B/Foo.php',
@@ -104,7 +108,7 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
             )),
         );
 
-        if (PHP_VERSION_ID >= 50400) {
+        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',
@@ -115,6 +119,12 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
             ));
         }
 
+        if (\PHP_VERSION_ID >= 50500) {
+            $data[] = array(__DIR__.'/Fixtures/php5.5', array(
+                'ClassCons\\Foo' => __DIR__.'/Fixtures/php5.5/class_cons.php',
+            ));
+        }
+
         return $data;
     }
 
@@ -134,10 +144,10 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
     protected function assertEqualsNormalized($expected, $actual, $message = null)
     {
         foreach ($expected as $ns => $path) {
-            $expected[$ns] = strtr($path, '\\', '/');
+            $expected[$ns] = str_replace('\\', '/', $path);
         }
         foreach ($actual as $ns => $path) {
-            $actual[$ns] = strtr($path, '\\', '/');
+            $actual[$ns] = str_replace('\\', '/', $path);
         }
         $this->assertEquals($expected, $actual, $message);
     }

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/Namespaced/WithDirMagic.php

@@ -0,0 +1,15 @@
+<?php
+
+/*
+ * foo
+ */
+
+namespace Namespaced;
+
+class WithDirMagic
+{
+    public function getDir()
+    {
+        return __DIR__;
+    }
+}

Tests/Fixtures/Namespaced/WithFileMagic.php

@@ -0,0 +1,15 @@
+<?php
+
+/*
+ * foo
+ */
+
+namespace Namespaced;
+
+class WithFileMagic
+{
+    public function getFile()
+    {
+        return __FILE__;
+    }
+}

Tests/Fixtures/Namespaced/WithHaltCompiler.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * foo
+ */
+
+namespace Namespaced;
+
+class WithHaltCompiler
+{
+}
+
+// the end of the script execution
+__halt_compiler(); data
+data
+data
+data
+...

Tests/Fixtures/Namespaced/WithStrictTypes.php

@@ -0,0 +1,13 @@
+<?php
+
+/*
+ * foo
+ */
+
+declare(strict_types=1);
+
+namespace Namespaced;
+
+class WithStrictTypes
+{
+}

Tests/Fixtures/php5.5/class_cons.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace ClassCons;
+
+class Foo
+{
+    public function __construct()
+    {
+        \Foo\TBar/* foo */::class;
+    }
+}

Tests/LegacyApcUniversalClassLoaderTest.php

@@ -11,184 +11,179 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ApcUniversalClassLoader;
 
 /**
  * @group legacy
  */
-class LegacyApcUniversalClassLoaderTest extends \PHPUnit_Framework_TestCase
+class LegacyApcUniversalClassLoaderTest extends TestCase
 {
     protected function setUp()
     {
-        $this->iniSet('error_reporting', -1 & ~E_USER_DEPRECATED);
-
-        if (!extension_loaded('apc')) {
-            $this->markTestSkipped('The apc extension is not available.');
-        }
-
-        if (!(ini_get('apc.enabled') && ini_get('apc.enable_cli'))) {
-            $this->markTestSkipped('The apc extension is available, but not enabled.');
+        if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+            apcu_clear_cache();
         } else {
-            apc_clear_cache('user');
+            $this->markTestSkipped('APC is not enabled.');
         }
     }
 
     protected function tearDown()
     {
         if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
-            apc_clear_cache('user');
+            apcu_clear_cache();
         }
     }
 
     public function testConstructor()
     {
         $loader = new ApcUniversalClassLoader('test.prefix.');
-        $loader->registerNamespace('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
+        $loader->registerNamespace('LegacyApc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
 
-        $this->assertEquals($loader->findFile('\Apc\Namespaced\FooBar'), apc_fetch('test.prefix.\Apc\Namespaced\FooBar'), '__construct() takes a prefix as its first argument');
+        $this->assertEquals($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('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-       $loader->registerPrefix('Apc_Pearlike_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-       $loader->loadClass($testClassName);
-       $this->assertTrue(class_exists($className), $message);
-   }
+    /**
+     * @dataProvider getLoadClassTests
+     */
+    public function testLoadClass($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('\\Apc\\Namespaced\\Foo', 'Apc\\Namespaced\\Foo',   '->loadClass() loads Apc\Namespaced\Foo class'),
-           array('Apc_Pearlike_Foo',    'Apc_Pearlike_Foo',      '->loadClass() loads Apc_Pearlike_Foo class'),
+           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('Apc\Namespaced', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-       $loader->registerPrefix('Apc_Pearlike_', __DIR__.DIRECTORY_SEPARATOR.'Fixtures');
-       $loader->registerNamespaceFallbacks(array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/fallback'));
-       $loader->registerPrefixFallbacks(array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/fallback'));
-       $loader->loadClass($testClassName);
-       $this->assertTrue(class_exists($className), $message);
-   }
+    /**
+     * @dataProvider getLoadClassFromFallbackTests
+     */
+    public function testLoadClassFromFallback($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('\\Apc\\Namespaced\\Baz',    'Apc\\Namespaced\\Baz',    '->loadClass() loads Apc\Namespaced\Baz class'),
-           array('Apc_Pearlike_Baz',       'Apc_Pearlike_Baz',       '->loadClass() loads Apc_Pearlike_Baz class'),
-           array('\\Apc\\Namespaced\\FooBar', 'Apc\\Namespaced\\FooBar', '->loadClass() loads Apc\Namespaced\Baz class from fallback dir'),
-           array('Apc_Pearlike_FooBar',    'Apc_Pearlike_FooBar',    '->loadClass() loads Apc_Pearlike_Baz class from fallback dir'),
+           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);
+    /**
+     * @dataProvider getLoadClassNamespaceCollisionTests
+     */
+    public function testLoadClassNamespaceCollision($namespaces, $className, $message)
+    {
+        $loader = new ApcUniversalClassLoader('test.prefix.collision.');
+        $loader->registerNamespaces($namespaces);
 
-       $loader->loadClass($className);
+        $loader->loadClass($className);
 
-       $this->assertTrue(class_exists($className), $message);
-   }
+        $this->assertTrue(class_exists($className), $message);
+    }
 
     public function getLoadClassNamespaceCollisionTests()
     {
         return array(
            array(
                array(
-                   'Apc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha',
-                   'Apc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
                ),
-               'Apc\NamespaceCollision\A\Foo',
+               'LegacyApc\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',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
                ),
-               'Apc\NamespaceCollision\A\Bar',
+               'LegacyApc\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',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
                ),
-               'Apc\NamespaceCollision\A\B\Foo',
+               'LegacyApc\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',
+                   'LegacyApc\\NamespaceCollision\\A\\B' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta',
+                   'LegacyApc\\NamespaceCollision\\A' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha',
                ),
-               'Apc\NamespaceCollision\A\B\Bar',
+               '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);
+    /**
+     * @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);
-   }
+        $loader->loadClass($className);
+        $this->assertTrue(class_exists($className), $message);
+    }
 
     public function getLoadClassPrefixCollisionTests()
     {
         return array(
            array(
                array(
-                   'ApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/alpha/Apc',
-                   'ApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/Apc/beta/Apc',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
                ),
-               'ApcPrefixCollision_A_Foo',
-               '->loadClass() loads ApcPrefixCollision_A_Foo from alpha.',
+               'LegacyApcPrefixCollision_A_Foo',
+               '->loadClass() loads LegacyApcPrefixCollision_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',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
                ),
-               'ApcPrefixCollision_A_Bar',
-               '->loadClass() loads ApcPrefixCollision_A_Bar from alpha.',
+               'LegacyApcPrefixCollision_A_Bar',
+               '->loadClass() loads LegacyApcPrefixCollision_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',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
                ),
-               'ApcPrefixCollision_A_B_Foo',
-               '->loadClass() loads ApcPrefixCollision_A_B_Foo from beta.',
+               'LegacyApcPrefixCollision_A_B_Foo',
+               '->loadClass() loads LegacyApcPrefixCollision_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',
+                   'LegacyApcPrefixCollision_A_B_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/beta/LegacyApc',
+                   'LegacyApcPrefixCollision_A_' => __DIR__.DIRECTORY_SEPARATOR.'Fixtures/LegacyApc/alpha/LegacyApc',
                ),
-               'ApcPrefixCollision_A_B_Bar',
-               '->loadClass() loads ApcPrefixCollision_A_B_Bar from beta.',
+               'LegacyApcPrefixCollision_A_B_Bar',
+               '->loadClass() loads LegacyApcPrefixCollision_A_B_Bar from beta.',
            ),
        );
     }

Tests/LegacyUniversalClassLoaderTest.php

@@ -11,18 +11,14 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\UniversalClassLoader;
 
 /**
  * @group legacy
  */
-class LegacyUniversalClassLoaderTest extends \PHPUnit_Framework_TestCase
+class LegacyUniversalClassLoaderTest extends TestCase
 {
-    protected function setUp()
-    {
-        $this->iniSet('error_reporting', -1 & ~E_USER_DEPRECATED);
-    }
-
     /**
      * @dataProvider getLoadClassTests
      */

Tests/Psr4ClassLoaderTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\Psr4ClassLoader;
 
-class Psr4ClassLoaderTest extends \PHPUnit_Framework_TestCase
+class Psr4ClassLoaderTest extends TestCase
 {
     /**
      * @param string $className

UniversalClassLoader.php

@@ -11,6 +11,8 @@
 
 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.
  *
@@ -56,9 +58,8 @@ namespace Symfony\Component\ClassLoader;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  *
- * @api
- *
- * @deprecated Deprecated since version 2.4, to be removed in 3.0. Use the ClassLoader class instead.
+ * @deprecated since version 2.4, to be removed in 3.0.
+ *             Use the {@link ClassLoader} class instead.
  */
 class UniversalClassLoader
 {
@@ -134,8 +135,6 @@ class UniversalClassLoader
      * Registers the directory to use as a fallback for namespaces.
      *
      * @param array $dirs An array of directories
-     *
-     * @api
      */
     public function registerNamespaceFallbacks(array $dirs)
     {
@@ -156,8 +155,6 @@ class UniversalClassLoader
      * Registers directories to use as a fallback for class prefixes.
      *
      * @param array $dirs An array of directories
-     *
-     * @api
      */
     public function registerPrefixFallbacks(array $dirs)
     {
@@ -178,8 +175,6 @@ class UniversalClassLoader
      * Registers an array of namespaces.
      *
      * @param array $namespaces An array of namespaces (namespaces as keys and locations as values)
-     *
-     * @api
      */
     public function registerNamespaces(array $namespaces)
     {
@@ -193,8 +188,6 @@ class UniversalClassLoader
      *
      * @param string       $namespace The namespace
      * @param array|string $paths     The location(s) of the namespace
-     *
-     * @api
      */
     public function registerNamespace($namespace, $paths)
     {
@@ -205,8 +198,6 @@ class UniversalClassLoader
      * Registers an array of classes using the PEAR naming convention.
      *
      * @param array $classes An array of classes (prefixes as keys and locations as values)
-     *
-     * @api
      */
     public function registerPrefixes(array $classes)
     {
@@ -220,8 +211,6 @@ class UniversalClassLoader
      *
      * @param string       $prefix The classes prefix
      * @param array|string $paths  The location(s) of the classes
-     *
-     * @api
      */
     public function registerPrefix($prefix, $paths)
     {
@@ -232,8 +221,6 @@ class UniversalClassLoader
      * Registers this instance as an autoloader.
      *
      * @param bool $prepend Whether to prepend the autoloader or not
-     *
-     * @api
      */
     public function register($prepend = false)
     {

WinCacheClassLoader.php

@@ -58,10 +58,8 @@ class WinCacheClassLoader
     protected $decorated;
 
     /**
-     * Constructor.
-     *
-     * @param string $prefix    The WinCache namespace prefix to use.
-     * @param object $decorated A class loader object that implements the findFile() method.
+     * @param string $prefix    The WinCache namespace prefix to use
+     * @param object $decorated A class loader object that implements the findFile() method
      *
      * @throws \RuntimeException
      * @throws \InvalidArgumentException
@@ -123,8 +121,10 @@ class WinCacheClassLoader
      */
     public function findFile($class)
     {
-        if (false === $file = wincache_ucache_get($this->prefix.$class)) {
-            wincache_ucache_set($this->prefix.$class, $file = $this->decorated->findFile($class), 0);
+        $file = wincache_ucache_get($this->prefix.$class, $success);
+
+        if (!$success) {
+            wincache_ucache_set($this->prefix.$class, $file = $this->decorated->findFile($class) ?: null, 0);
         }
 
         return $file;

XcacheClassLoader.php

@@ -45,30 +45,18 @@ namespace Symfony\Component\ClassLoader;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Kris Wallsmith <kris@symfony.com>
  * @author Kim Hemsø Rasmussen <kimhemsoe@gmail.com>
- *
- * @api
  */
 class XcacheClassLoader
 {
     private $prefix;
-
-    /**
-     * A class loader object that implements the findFile() method.
-     *
-     * @var object
-     */
     private $decorated;
 
     /**
-     * Constructor.
-     *
-     * @param string $prefix    The XCache namespace prefix to use.
-     * @param object $decorated A class loader object that implements the findFile() method.
+     * @param string $prefix    The XCache namespace prefix to use
+     * @param object $decorated A class loader object that implements the findFile() method
      *
      * @throws \RuntimeException
      * @throws \InvalidArgumentException
-     *
-     * @api
      */
     public function __construct($prefix, $decorated)
     {
@@ -130,7 +118,7 @@ class XcacheClassLoader
         if (xcache_isset($this->prefix.$class)) {
             $file = xcache_get($this->prefix.$class);
         } else {
-            $file = $this->decorated->findFile($class);
+            $file = $this->decorated->findFile($class) ?: null;
             xcache_set($this->prefix.$class, $file);
         }
 

composer.json

@@ -3,7 +3,7 @@
     "type": "library",
     "description": "Symfony ClassLoader Component",
     "keywords": [],
-    "homepage": "http://symfony.com",
+    "homepage": "https://symfony.com",
     "license": "MIT",
     "authors": [
         {
@@ -12,24 +12,26 @@
         },
         {
             "name": "Symfony Community",
-            "homepage": "http://symfony.com/contributors"
+            "homepage": "https://symfony.com/contributors"
         }
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=5.3.3"
+        "php": ">=5.3.9",
+        "symfony/polyfill-apcu": "~1.1"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "~2.7",
-        "symfony/finder": "~2.0,>=2.0.5"
+        "symfony/finder": "^2.0.5"
     },
     "autoload": {
-        "psr-0": { "Symfony\\Component\\ClassLoader\\": "" }
+        "psr-4": { "Symfony\\Component\\ClassLoader\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
     },
-    "target-dir": "Symfony/Component/ClassLoader",
     "extra": {
         "branch-alias": {
-            "dev-master": "2.6-dev"
+            "dev-master": "2.7-dev"
         }
     }
 }

phpunit.xml.dist

@@ -5,10 +5,13 @@
          backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php"
+         failOnRisky="true"
+         failOnWarning="true"
 >
     <php>
         <ini name="error_reporting" value="-1" />
     </php>
+
     <testsuites>
         <testsuite name="Symfony ClassLoader Component Test Suite">
             <directory>./Tests/</directory>