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<?php namespace Sylius\Bundle\ResourceBundle\DependencyInjection; class SyliusResourceExtension { function test() { echo call_user_func(array(str_replace('Extension', 'Bundle', get_class($this)), 'bar'); } function bar() { echo 'foo'; } } namespace Sylius\Bundle\ProductBundle\DependencyInjection; use Sylius\Bundle\ResourceBundle\DependencyInjection\SyliusResourceExtension; { class SyliusProductExtension extends SyliusResourceExtension {} } $a = new SyliusProductExtension(); $a->test();