WC_Data::__construct PHP 메소드

    public function __construct($read = 0)
    {
        $this->default_data = $this->data;
    }

 /**
  * Simple read.
  */
 public function __construct($id = '')
 {
     parent::__construct();
     if (!empty($id)) {
         $this->read($id);
     }
 }