PHP如何訪問對象數組

Question

如何從下面的對象數組訪問項目陣列

Cart66Cart Object 
(
[_items:Cart66Cart:private] => Array 
    (
     [2] => Cart66CartItem Object 
      (
       [_productId:Cart66CartItem:private] => 327 
       [_quantity:Cart66CartItem:private] => 3 
       [_optionInfo:Cart66CartItem:private] => 
       [_priceDifference:Cart66CartItem:private] => 0 
       [_customFieldInfo:Cart66CartItem:private] => 
       [_productUrl:Cart66CartItem:private] => http://localhost/odesk/cart66/fran-wilson-aloe-lip-care/ 
       [_formEntryIds:Cart66CartItem:private] => Array 
        (
        ) 

      ) 

     [3] => Cart66CartItem Object 
      (
       [_productId:Cart66CartItem:private] => 368 
       [_quantity:Cart66CartItem:private] => 2 
       [_optionInfo:Cart66CartItem:private] => 
       [_priceDifference:Cart66CartItem:private] => 0 
       [_customFieldInfo:Cart66CartItem:private] => 
       [_productUrl:Cart66CartItem:private] => http://localhost/odesk/cart66/beauty-strokes-basic-shadow-brush/ 
       [_formEntryIds:Cart66CartItem:private] => Array 
        (
        ) 

      ) 

    ) 

[_promotion:Cart66Cart:private] => 
[_promoStatus:Cart66Cart:private] => 0 
[_shippingMethodId:Cart66Cart:private] => 13 
[_liveRates:Cart66Cart:private] => Cart66LiveRates Object 
    (
     [toZip] => 
     [weight] => 
     [rates] => Array 
      (
      ) 

     [_toCountryCode:protected] => 
    ) 

) 

Answer 1

事情是這樣的，也許：

$object->_items[index]->_productId 

但是如果_items是私人的，你需要一個公共的getter或者與Reflection類混淆。您可以設置私有財產通過ReflectionProperty 可訪問試試這個：

$reflectionObject = new ReflectionObject($yourObject); 
    $property = $reflectionObject->getProperty('_items'); 
    $property->setAccessible(true); 
    $items = $property->getValue($yourObject); 

Answer 2

嘗試以下操作：

$object->$first_node->$second_node->$third_node; 

Answer 3

如果必須訪問私人/保護類屬性，你可以簡單地使用magic __get method。在這種情況下，反思會過度。不過，在這種情況下使用魔法方法是否具有良好的設計意義取決於你的情況。

class MyClass 
{ 
    private $_items; 

    public function __get($prop) 
    { 
     if ($prop == '_items') { 
      return $this->_items; 
     } 
     throw new OutOfBoundsException; 
    } 
} 

UPDATE

重讀看來你以後只是想你的對象表現得像一個數組。爲此，您需要執行ArrayAccess並將相關方法指向私有$_items屬性。

class MyClass implements ArrayAccess 
{ 
    private $_items = array(); 

    public function __construct() { 
     $this->_items = array(
      "one" => 1, 
      "two" => 2, 
      "three" => 3, 
     ); 
    } 
    public function offsetSet($offset, $value) { 
     if (is_null($offset)) { 
      $this->_items[] = $value; 
     } else { 
      $this->_items[$offset] = $value; 
     } 
    } 
    public function offsetExists($offset) { 
     return isset($this->_items[$offset]); 
    } 
    public function offsetUnset($offset) { 
     unset($this->_items[$offset]); 
    } 
    public function offsetGet($offset) { 
     return isset($this->_items[$offset]) ? $this->_items[$offset] : null; 
    } 
} 

而且最後，PHP有一個內置的ArrayObject類，這將使一個對象的行爲非常像一個陣列。你總是可以使用它並將相關方法指向私有的$_items屬性。