PHP 实现多服务器共享 SESSION 数据(4)

    function write($sesskey, $data) {
         global $MY_SESS_CONN;
        
        $qkey = $MY_SESS_CONN->qstr($sesskey);
        $expiry = time() + My_SESS_TIME;    //设置过期时间
        
         //写入 SESSION
        $arr = array(
            'sesskey' => $qkey,
            'expiry'  => $expiry,
            'data'    => $data);
        $MY_SESS_CONN->Replace('sess', $arr, 'sesskey', $autoQuote = true);
         return true;
     }   //end function

    function destroy($sesskey) {
         global $MY_SESS_CONN;

        $sql = 'DELETE FROM sess WHERE sesskey=' . $MY_SESS_CONN->qstr($sesskey);
        $rs =& $MY_SESS_CONN->Execute($sql);
         return true;
     }   //end function

    function gc($maxlifetime = null) {
         global $MY_SESS_CONN;

        $sql = 'DELETE FROM sess WHERE expiry<' . time();
        $MY_SESS_CONN->Execute($sql);
        //由于经常性的对表 sess 做删除操作，容易产生碎片，
         //所以在垃圾回收中对该表进行优化操作。
        $sql = 'OPTIMIZE TABLE sess';
        $MY_SESS_CONN->Execute($sql);
         return true;
     }   //end function
}   ///:~