在XML配置中將Symfony 2標籤屬性定義爲數組？

Question

<service id="my_service"> 
    <tag name="my_transport" supports="feature1, feature2, feature3" /> 
</service> 

在處理XML配置時，可以將supports屬性定義爲array而不是執行preg_split？

Answer 1

沒有辦法將屬性定義爲array。

DependencyInjection裝載機不支持這一點。 （例來自yml加載拋出異常A "tags" attribute must be of a scalar-type (...)如果你試試這個）

XmlFileLoader loading tags使用phpize解析屬性值，空，布爾值，數字或字符串。

向服務定義添加標記不會覆蓋以前添加的標記的定義，但會向數組添加新條目。

public function addTag($name, array $attributes = array()) 
{ 
    $this->tags[$name][] = $attributes; 

    return $this; 
} 

所以，你應該嘗試創建多個<tag>元素（如沃特·Ĵ說）

如果您的XML文件會像

<service id="my_service"> 
    <tag name="my_transport" supports="feature1" /> 
    <tag name="my_transport" supports="feature2" /> 
    <tag name="my_transport" supports="feature3" /> 
</service> 

然後$屬性標籤my_transport將

Array 
(
    [0] => Array 
     (
      [supports] => feature1 
     ) 

    [1] => Array 
     (
      [supports] => feature2 
     ) 

    [2] => Array 
     (
      [supports] => feature3 
     ) 

) 

樣本用法

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

class MyCompilerPass implements CompilerPassInterface 
{ 
    public function process(ContainerBuilder $container) 
    { 
     $definition = $container->getDefinition('my_transport_service'); 

     // Extensions must always be registered before everything else. 
     // For instance, global variable definitions must be registered 
     // afterward. If not, the globals from the extensions will never 
     // be registered. 
     $calls = $definition->getMethodCalls(); 
     $definition->setMethodCalls(array()); 
     foreach ($container->findTaggedServiceIds('my_transport') as $id => $attributes) { 
      // print_r($attributes); 
      foreach($attributes as $attrs) 
      { 
       switch($attrs['supports']){ 
        case 'feature1': 
         $definition->addMethodCall('addTransportFeature1', array(new Reference($id))); 
         break; 
        case 'feature2': 
         $definition->addMethodCall('addTransportFeature2', array(new Reference($id))); 
         break; 
        case 'feature3': 
         $definition->addMethodCall('addTransportFeature3', array(new Reference($id))); 
         break; 
       } 
      } 
     } 
     $definition->setMethodCalls(array_merge($definition->getMethodCalls(), $calls)); 
    } 
}