PHP Silex如何使用递归？

Question

这里在indexAction我必须打电话给subcat函数递归获取类别和子类别的列表，否则它不起作用。

注意subcat自称。

如何在indexAction之外编写subcat函数？并从内部呼叫IndexAction。这样做，我可以重复使用subcat。

class ItemsController implements ControllerProviderInterface { 
    public function connect(Application $app) { 
     $controllers = $app['controllers_factory']; 

     $controllers 
     ->get('/', array($this, 'indexAction')) 
     ->bind('items_index'); 

     return $controllers; 
    } 

    public function indexAction(Application $app) { 
     $categorias = array(); 

     function subcat($idPadre, array & $categorias, $app) { 
      $sql = 'SELECT id, categoria FROM categorias' . 
       ' WHERE id_padre=' . $idPadre . 
       ' ORDER BY categoria'; 
      $query = $app['db']->fetchAll($sql); 

      foreach ($query as $valor) { 
       $a = subcat($valor['id'], $categorias, $app); 
       $lista[$valor['id'].'-'.$valor['categoria']] = $a; 
      } 

      return $lista; 
     }; 

     $estructura = subcat(0, $categorias, $app); 
     print_r($estructura); 
     return ''; 
    }  
} 

Answer 1

您可以将可重用代码注册为服务。如果您发现任何你所需要的：LINK

Answer 2

我解决了这个做服务，其中$应用[“Categorias.lista”]包含所有类别：

$app['Categorias.idPadre'] = 0; 
$app['Categorias.lista'] = ''; 
$app['Categorias'] = $app->share(function ($app) { 
    function subcat($idPadre, $app) { 
     $sql = 'SELECT id, categoria FROM categorias' . 
       ' WHERE id_padre=' . $idPadre . 
       ' ORDER BY categoria'; 
     $query = $app['db']->fetchAll($sql); 

     foreach ($query as $valor) { 
      $lista[$valor['id'].'-'.$valor['categoria']] = subcat($valor['id'], $app); 
     } 

     return $lista; 
    }; 

    $app['Categorias.lista'] = subcat($app['Categorias.idPadre'], $app); 
}); 

然后我在的indexAction方法测试：

$app['Categorias.idPadre'] = 0; 
$app['Categorias']; 
print_r($app['Categorias.lista']); 

和print_r的给出了这个在我的例子：

Array 
(
    [2-capacitor] => Array 
     (
      [14-ceramico] => 
      [12-electrolitico] => 
      [13-multicapa] => 
      [16-polipropileno] => 
      [15-polyester] => 
     ) 

    [3-circuito impreso] => 
    [4-diodo] => 
    [1-resistencia] => Array 
     (
      [11-ceramica] => 
      [5-metal] => Array 
       (
        [8-1W] => 
        [9-2W] => 
        [10-3W] => 
        [7-mini] => 
       ) 

     ) 

    [20-teclado] => 
    [21-transformador] => 
    [17-transistor] => Array 
     (
      [18-bipolar] => 
      [19-mosfet] => 
     ) 

) 

Answer 3

你所要做的就是在你的ItemsController中使你的内部函数成为一个私有函数。

class ItemsController implements ControllerProviderInterface { 
    public function connect(Application $app) { 
     $controllers = $app['controllers_factory']; 

     $controllers 
     ->get('/', array($this, 'indexAction')) 
     ->bind('items_index'); 

     return $controllers; 
    } 

    public function indexAction(Application $app) { 
     $categorias = array(); 

     $estructura = $this->subcat(0, $categorias, $app); 
     print_r($estructura); 
     return ''; 
    } 

    private function subcat($idPadre, array & $categorias, $app) { 
     $sql = 'SELECT id, categoria FROM categorias' . 
      ' WHERE id_padre=' . $idPadre . 
      ' ORDER BY categoria'; 
     $query = $app['db']->fetchAll($sql); 

     foreach ($query as $valor) { 
      $a = $this->subcat($valor['id'], $categorias, $app); 
      $lista[$valor['id'].'-'.$valor['categoria']] = $a; 
     } 

     return $lista; 
    } 
}