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Pantheon Automation 2016-04-20 09:56:34 -07:00 • committed by Greg Anderson
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vendor/symfony/class-loader/README.md vendored
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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)