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:
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:
$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:
$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:
$loader->addPrefix('Symfony', array(__DIR__.'/src', __DIR__.'/symfony/src'));Alternatively, you can use the addPrefixes() method to register more
than one namespace at once:
$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:
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.
You can run the unit tests with the following command:
$ cd path/to/Symfony/Component/ClassLoader/
$ composer install
$ phpunit
