小编Jay*_*Mee的帖子

下面的代码给出了错误，我可能语法错误，我不知道在哪里。错误是：near '(``last_online``) VALUE ('now()) WHERE (users.id = 55)' at line 1。

PHP代码：

   <?php 
include 'dbc.php';
session_start();
$user_ip = $_SERVER['REMOTE_ADDR'];

$id = $_SESSION['user_id'];

$sql_insert1 = "UPDATE `users` SET (`last_online`)
            VALUES
            ('now()) WHERE (users.id = $id)";

mysql_query($sql_insert1) or die("Insertion Failed:" . mysql_error());
$sql_insert2 = "UPDATE `users` SET (`users_ip`)
            VALUES
            ('$user_ip') WHERE (users.id = $id)";

mysql_query($sql_insert2) or die("Insertion Failed:" . mysql_error());