namespace AppBundle\ExPRessionLanguage;

use Symfony\component\ExpressionLanguage\ExpressionLanguage as BaseExpressionLanguage;
use Symfony\Component\ExpressionLanguage\ParserCache\ParserCacheinterface;

class ExpressionLanguage extends BaseExpressionLanguage
{
    public function __construct(ParserCacheInterface $parser = null,array $providers = array())
    {
        // prePEnd the default provider to let users override IT easily
        array_unshift($providers,new AppExpressionLanguageProvider());

        parent::__construct($parser,$providers);
    }
}

标记security.expression_language_provider仅用于将语言提供程序添加到symfonys安全组件中使用的表达式语言,或者更具体地说,在ExpressionVoter中.

FrameworkBundle的@ Security-Annotation使用表达式语言的不同实例,该实例不了解您创建的语言提供程序.

为了能够在@ Security-Annotation中使用自定义语言提供程序,我使用以下编译器传递解决了这个问题：

<?PHP

namespace ApiBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\Reference;

/**
 * This compiler pass adds language providers tagged
 * with security.expression_language_provider to the
 * expression language used in the framework extra bundle.
 *
 * This allows to use custom expression language functions
 * in the @Security-Annotation.
 *
 * Symfony\Bundle\FrameworkBundle\DependencyInection\Compiler\AddExpressionLanguageProvidersPass
 * does the same,but only for the security.expression_language
 * which is used in the ExpressionVoter.
 */
class AddExpressionLanguageProvidersPass implements CompilerPassInterface
{
    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container)
    {
        if ($container->has('sensio_framework_extra.security.expression_language')) {
            $deFinition = $container->findDeFinition('sensio_framework_extra.security.expression_language');
            foreach ($container->findTaggedServiceIds('security.expression_language_provider') as $id => $attributes) {
                $deFinition->addMethodCall('registerProvider',array(new Reference($id)));
            }
        }
    }
}

这样,ExpressionVoter和FrameworkBundle使用的表达式语言都使用相同的语言提供程序进行配置.