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symfony事件的使用

关键词: symfony

symfony事件的使用

###定义一个事件
```
<?php
namespace Xxfaxy\ServiceBundle\Event;
use Symfony\Component\EventDispatcher\Event;
class TestEvent extends Event
{
    public $flag;
    public $data;
    
    public function __construct($flag, $data)
    {
        $this->flag = $flag;
        $this->data = $data;
    }
}
?>
```
###监听一个事件(services.yml里面配置)
```
services:
    service.test.event:
        class: Xxfaxy\ServiceBundle\EventListener\TestEventListener
        arguments: ["@service_container"]
        tags:
            - { name: kernel.event_listener, event: test.event, method: event }
```
###监听器的逻辑实现
```
<?php
namespace Xxfaxy\ServiceBundle\EventListener;
class TestEventListener
{
    private $container;

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

public function event($event)
    {
        echo $event->flag,$event->data;
    }
}
?>
```
###触发一个事件(假设在控制器里面)
```
<?php
use Xxfaxy\ServiceBundle\Event\TestEvent;
class TestController extends Controller
{
    public function testAction(Request $request)
    {
        $dispatcher = $this->get('event_dispatcher');
        $testEvent = new TestEvent('flag', 'data');
        $dispatcher->dispatch('test.event', $testEvent);
    }
}
?>
```

admin
2016-11-23 17:26:53
php symfony

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symfony事件的使用