PSR-0 Class Loader

require_once '/path/to/src/Symfony/Component/ClassLoader/ClassLoader.php';
 
use Symfony\Component\ClassLoader\ClassLoader;
 
$loader = new ClassLoader();
 
// to enable searching the include path (eg. for PEAR packages)
// 开启路径搜索（如，对于PEAR包）
$loader->setUseIncludePath(true);
 
// ... register namespaces and prefixes here - see below
// ... 在这里注册命名空间和前缀 - 见下文
 
$loader->register();

// register a single namespaces
// 注册一个单一的命名空间
$loader->addPrefix('Symfony', __DIR__.'/vendor/symfony/symfony/src');
 
// register several namespaces at once
// 一次注册多个命名空间
$loader->addPrefixes(array(
    'Symfony' => __DIR__.'/../vendor/symfony/symfony/src',
    'Monolog' => __DIR__.'/../vendor/monolog/monolog/src',
));
 
// register a prefix for a class following the PEAR naming conventions
// 给一个遵循PEAR命名约定的类，注册一个前缀
$loader->addPrefix('Twig_', __DIR__.'/vendor/twig/twig/lib');
 
$loader->addPrefixes(array(
    'Swift_' => __DIR__.'/vendor/swiftmailer/swiftmailer/lib/classes',
    'Twig_'  => __DIR__.'/vendor/twig/twig/lib',
));

$loader->addPrefixes(array(
    'Doctrine\\Common'           => __DIR__.'/vendor/doctrine/common/lib',
    'Doctrine\\DBAL\\Migrations' => __DIR__.'/vendor/doctrine/migrations/lib',
    'Doctrine\\DBAL'             => __DIR__.'/vendor/doctrine/dbal/lib',
    'Doctrine'                   => __DIR__.'/vendor/doctrine/orm/lib',
));