不知道這是phpcms系統的錯誤還是php的錯誤，還是我自身的錯誤

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<?phpdefined(‘IN_PHPCMS‘) or exit(‘No permission resources.‘);pc_base::load_app_func(‘global‘);class index{private $db;private $content_db;private $order_db;public function __construct(){}/** * 處理，填寫訂單資訊 */public function init(){new_addslashes(new_html_special_chars($_POST));extract($_POST[‘info‘]);$this->content_db=pc_base::load_model(‘content_model‘);$this->content_db->set_model($modelid);$line_data=$this->content_db->get_content($catid,$line_id);//print_r($line_data);$prices=string2array($line_data[‘price‘]);if ($is_group == 1){foreach ($prices as $key =>$val){if ($val[‘title‘] == $line_type){$price_group=$prices[$key];}}unset($prices);$prices[0]=$price_group;}$order_sn=get_order_sn();includetemplate(‘order‘,‘index‘);}/** * 處理，確認訂單資訊 */public function confirm_order(){new_addslashes(new_html_special_chars($_POST));extract($_POST[‘info‘]);includetemplate(‘order‘,‘confirm_order‘);}/** * 儲存訂單 */public function save_order(){new_addslashes(new_html_special_chars($_POST));$this->order_db = pc_base::load_model(‘order_model‘);   //載入模型並且執行個體化$this->db = pc_base::load_model(‘order_model‘);   //載入模型並且執行個體化ReflectionObject::export($this->order_db);   //反射輸出的是一樣的ReflectionObject::export($this->db);         //同上var_dump(method_exists($this->db, ‘add_order‘));  //truevar_dump(is_callable(array($this->order_db, ‘add_order‘)));  //true     var_dump(method_exists($this->order_db, ‘add_order‘));     //truevar_dump(is_callable(array($this->db, ‘add_order‘)));    //true$this->db->add_order();     //可以調用$this->order_db—>add_order();   //不可以調用，致命錯誤  Fatal error: Call to undefined function add_order() in /var/www/html/line/phpcms/modules/order/index.php on line 56include template(‘order‘,‘save_order‘);}}

不知道這是phpcms系統的錯誤還是php的錯誤，還是我自身的錯誤