php对象转数组

function object_to_array($obj)
{
    $_arr = is_object($obj) ? get_object_vars($obj) : $obj;
    foreach ($_arr as $key => $val) {
        $val = (is_array($val) || is_object($val)) ? object_to_array($val) : $val;
        $arr[$key] = $val;
    }
    return $arr;
}