fixed Composer constraints

ApcClassLoader.php

@@ -16,8 +16,8 @@ namespace Symfony\Component\ClassLoader;
  *
  * 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;

ApcUniversalClassLoader.php

@@ -0,0 +1,103 @@
+<?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 version 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;
+
+    /**
+     * Constructor.
+     *
+     * @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

@@ -1,14 +1,6 @@
 CHANGELOG
 =========
 
-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

@@ -44,7 +44,10 @@ 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, $declared);
@@ -95,7 +98,10 @@ class ClassCollectionLoader
             return;
         }
         if (!$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());
+            }
         }
 
         $spacesRegex = '(?:\s*+(?:(?:\#|//)[^\n]*+\n|/\*(?:(?<!\*/).)++)?+)*+';
@@ -329,10 +335,12 @@ 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;
+                    }
                 }
             }
         }

ClassMapGenerator.php

@@ -11,6 +11,14 @@
 
 namespace Symfony\Component\ClassLoader;
 
+if (!defined('SYMFONY_TRAIT')) {
+    if (PHP_VERSION_ID >= 50400) {
+        define('SYMFONY_TRAIT', T_TRAIT);
+    } else {
+        define('SYMFONY_TRAIT', 0);
+    }
+}
+
 /**
  * ClassMapGenerator.
  *
@@ -114,7 +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) {

DebugClassLoader.php

@@ -0,0 +1,120 @@
+<?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 version 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;
+
+    /**
+     * Constructor.
+     *
+     * @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 version 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));
+            }
+        }
+    }
+}

Psr4ClassLoader.php

@@ -45,7 +45,8 @@ 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';

Tests/ApcClassLoaderTest.php

@@ -11,10 +11,11 @@
 
 namespace Symfony\Component\ClassLoader\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\ClassLoader\ApcClassLoader;
 use Symfony\Component\ClassLoader\ClassLoader;
 
-class ApcClassLoaderTest extends \PHPUnit_Framework_TestCase
+class ApcClassLoaderTest extends TestCase
 {
     protected function setUp()
     {

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';
@@ -18,8 +19,11 @@ 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()
     {
         require_once __DIR__.'/Fixtures/deps/traits.php';
@@ -91,6 +95,7 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
 
     /**
      * @dataProvider getDifferentOrdersForTraits
+     * @requires PHP 5.4
      */
     public function testClassWithTraitsReordering(array $classes)
     {
@@ -134,6 +139,9 @@ class ClassCollectionLoaderTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    /**
+     * @requires PHP 5.4
+     */
     public function testFixClassWithTraitsOrdering()
     {
         require_once __DIR__.'/Fixtures/ClassesWithParents/CTrait.php';

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()
     {

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
@@ -105,18 +106,24 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_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/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/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 (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+            apcu_clear_cache();
+        } else {
+            $this->markTestSkipped('APC is not enabled.');
+        }
+    }
+
+    protected function tearDown()
+    {
+        if (ini_get('apc.enabled') && ini_get('apc.enable_cli')) {
+            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

@@ -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

@@ -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 version 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

@@ -16,10 +16,12 @@ namespace Symfony\Component\ClassLoader;
  *
  * 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');

XcacheClassLoader.php

@@ -16,10 +16,12 @@ namespace Symfony\Component\ClassLoader;
  *
  * 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');

composer.json

@@ -17,14 +17,11 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=5.5.9"
-    },
-    "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"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\ClassLoader\\": "" },
@@ -34,7 +31,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "3.1-dev"
+            "dev-master": "2.7-dev"
         }
     }
 }