symfony/src/Symfony/Component/ClassLoader/DebugUniversalClassLoader.php

<?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;

/**
 * Checks that the class is actually declared in the included file.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class DebugUniversalClassLoader extends UniversalClassLoader
{
    /**
     * Replaces all regular UniversalClassLoader instances by a DebugUniversalClassLoader ones.
     */
    static public 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());

                $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))) {
                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));
            }
        }
    }
}