Symfony2 - 从编译器传递中访问内核

Question

有没有办法从编译器传递中访问内核？我试过这个:

    ...
    public function process(ContainerBuilder $container)
    {
        $kernel = $container->get('kernel');
    }
    ...

这会引发错误.还有另一种方法吗？

Answer 1

据我所知,默认情况下,内核在CompilerPass中的任何位置都不可用.

但你可以通过这样做添加它:

在AppKernel中,将$ this传递给编译器传递所在的包.

• 向Bundle对象添加一个构造函数,该对象接受内核作为参数并将其存储为属性.
• 在Bundle :: build()函数中,将内核传递给CompilerPass实例.
• 在CompilerPass中,在构造函数中接受内核作为参数并将其存储为属性.
• 然后你可以在编译器传递中使用$ this-> kernel.

// app/AppKernel.php
new My\Bundle($this);

// My\Bundle\MyBundle.php
use Symfony\Component\HttpKernel\KernelInterface;

class MyBundle extends Bundle {
protected $kernel;

public function __construct(KernelInterface $kernel)
{
  $this->kernel = $kernel;
}

public function build(ContainerBuilder $container)
{
    parent::build($container);
    $container->addCompilerPass(new MyCompilerPass($this->kernel));
}

// My\Bundle\DependencyInjection\MyCompilerPass.php
use Symfony\Component\HttpKernel\KernelInterface;

class MyCompilerPass implements CompilerPassInterface
protected $kernel;

public function __construct(KernelInterface $kernel)
{
   $this->kernel = $kernel;
}

public function process(ContainerBuilder $container)
{
    // Do something with $this->kernel
}

Answer 2

如果你需要整个内核,samanime推荐的是什么.

如果您只对内核包含的某些值感兴趣,那么仅使用symfony设置的参数就足够了.

以下是可用的列表:

Array
(
    [0] => kernel.root_dir
    [1] => kernel.environment
    [2] => kernel.debug
    [3] => kernel.name
    [4] => kernel.cache_dir
    [5] => kernel.logs_dir
    [6] => kernel.bundles
    [7] => kernel.charset
    [8] => kernel.container_class
    [9] => kernel.secret
    [10] => kernel.http_method_override
    [11] => kernel.trusted_hosts
    [12] => kernel.trusted_proxies
    [13] => kernel.default_locale
)

例如,它kernel.bundles包含格式中所有已注册包的列表[bundle => class].

PS:我使用以下编译器传递获取此列表:

<?php
namespace Acme\InfoBundle\DependencyInjection;

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

class InfoCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        print_r(array_values(array_filter(
            array_keys($container->getParameterBag()->all()), 
            function ($e) {
                return strpos($e, 'kernel') === 0;
            }
        )));
        die;
    }
}