Question

好的，所以当我尝试登录时出现此错误：

Notice: Undefined variable: numrows in C:\xampp\htdocs\website\login.php on line 14

该用户不存在。你是否注意到任何错误，试图学习PHP和MySQL。这是代码

INDEX PHP PAGE

<html>
    <form action="login.php" method="POST">
        Username: <input type="text" name="username"><br />
        Password: <input type="password" name="password"><br />
        <input type="submit" name="Login In"><br />
    </form>
</html>

PHP登录页

<?php
$username = $_POST['username'];
$password = $_POST['password'];

if ($username&&$password)
{
    $connect = mysql_connect("localhost","root","") or die("Couldn't Connect!");
    mysql_select_db("phplogin") or die("Couldn't Find DB!");

    $query = mysql_query("SELECT * FROM users WHERE username='username'");

    $numrow = mysql_num_rows($query);

    if ($numrows!=0)
    {
        // code to login
    }
    else
        die("That user doesn't exist");

}
else
    die("Please enter and username and password!");
?>

Answer 1

if ($numrows!=0)应为if ($numrow!=0)

你忘记了查询中的$：

$query = mysql_query("SELECT * FROM users WHERE username='".$username."'");

我的php登录页面有什么问题？

1 个答案: