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<?php namespace Sylius\Bundle\ResourceBundle\DependencyInjection { class SyliusResourceExtension { function test() { echo str_replace('Extension', 'Bundle', trim(strrchr(__CLASS__, '\\'), '\\')); } } } namespace Sylius\Bundle\ProductBundle\DependencyInjection { use Sylius\Bundle\ResourceBundle\DependencyInjection\SyliusResourceExtension; class SyliusProductExtension extends SyliusResourceExtension {} } $a = new SyliusProductExtension(); $a->test();