爲什麼getProperty通過PHP ReflectionClass返回null

Question

我正在創建一個新的ReflectionClass，然後將受保護的屬性_products設置爲可訪問。它總是返回null我在這裏做錯了什麼？我在5.4.11

$project = new ReflectionClass($instance_of_object); 
$property = $project->getProperty('_products'); 
$property->setAccessible(true); 
$products = $property->getValue($project); 

我想，以確保財產在我的單元測試正確設置...

Answer 1

我準備工作簡單的例子。如果你可以執行它，必須有其他地方的錯誤代碼：

class The_Class { 

    private $_products; 

    public function __construct() { 
     $this->_products = 'foo'; 
    } 
} 

$instance_of_class = new The_Class(); 
$reflClass = new ReflectionClass($instance_of_class); 
$member = $reflClass->getProperty('_products'); 
$member->setAccessible(true); 
// Here is an error in your code: 
// Note that I'm using $instance_of_class, rather then 
// $reflClass as argument to getValue() 
var_dump($member->getValue($instance_of_class)); // string(3) "foo"