public function __construct() { //调用父类的构造方法 parent::__construct(); //修改session机制 session_set_save_handler(array($this, 'sess_open'), array($this, 'sess_close'), array($this, 'sess_read'), array($this, 'sess_write'), array($this, 'sess_destroy'), array($this, 'sess_gc')); }