function ip_get_method($action , $device){
    if($action != 'search'){
        request_die(false,'unknown action');
    }
    $mysqli = open_database();
    $stmt = $mysqli->prepare("select * from ip_addr WHERE device = ?");
    $stmt->bind_param("s",$device);
    $stmt->execute();
    $result = $stmt->get_result();
    if(!$result || $result->num_rows == 0)
    {
        $mysqli->close();
        request_die(false,'no such device');
    }
    $set = $result->fetch_assoc();
    echo json_encode(array('code'=>true,'ip'=>$set['ip']));
}

MySQL Native Driver Only

Available only with mysqlnd.

原来这个函数必须安装mysqlnd驱动才能使用。

Ubuntu上

sudo apt-get install php5-mysqlnd

安装驱动即可。