Question

我目前正在升级朋友网站的代码，并且遇到了登录脚本的问题。我正在尝试使用mysql_real_escape_string()来阻止SQL注入。 mysql_escape_string()工作正常但mysql_real_escape_string()没有。这就是我所拥有的：

if (isset($_POST['submit']))
{
    $username = mysql_real_escape_string($_POST['username']); 
    $password = mysql_real_escape_string($_POST['password']);

    $db_link = db_connect("project");
    $query = "SELECT * FROM user WHERE username = '$username' AND password = password('$password')";
    $result = mysql_query($query) or die (mysql_error());
    $numrows = mysql_num_rows($result);

    if($numrows == 1)
    {
        RedirectToURL("home.php");
    }
    else
    {
        login_page("Invalid login! Try again");
    }   
}
else
{
    login_page("");
}

Answer 1

要使用mysql_real_escape_string，您必须登录数据库。如果您尚未登录，请使用mysql_escape_string。

Answer 2

正如@MichaelBerkowski在你的评论中所说，将mysql_real_escape_string()个电话移到你的连接命令之后：

if (isset($_POST['submit']))
{

    $db_link = db_connect("project");

    $username = mysql_real_escape_string($_POST['username']); 
    $password = mysql_real_escape_string($_POST['password']);

    $query = "SELECT * FROM user WHERE username = '$username' AND password = password('$password')";
    $result = mysql_query($query) or die (mysql_error());
    $numrows = mysql_num_rows($result);

    if($numrows == 1)
    {
        RedirectToURL("home.php");
    }
    else
    {
        login_page("Invalid login! Try again");
    }   
}
else
{
    login_page("");
}

如上所述，原因是that mysql_real_escape_string()取决于你的mysql连接工作

mysql_real_escape_string - 登录脚本

2 个答案: