对象转换为数组

function object_to_array($obj){
        $obj = (array)$obj;
        foreach ($obj as $k => $v) {
            if (gettype($v) == 'resource') {
                return;
            }
            if (gettype($v) == 'object' || gettype($v) == 'array') {
                $obj[$k] = (array)$this->object_to_array($v);
            }
        }    
        return $obj;
}