PHP登录“无效的用户名和密码”

Question

我正在尝试创建一个简单的php登录系统。即使用户名和＆amp;密码存在于数据库中，它不起作用，但显示“无效的用户名和密码”错误消息。

<?php
session_start();

    $con=mysqli_connect("localhost","root","");
    mysqli_select_db($con,"server2go");

    if(mysqli_connect_errno())
        echo "<h2>Failed to connect to MySQL database!".mysqli_connect_errno();

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

        $sql=mysqli_query($con, "SELECT username FROM userlogin WHERE username='$username' AND     password='$password' limit 1 ");

        if(mysqli_num_rows($sql)==1)
        {                           
            $data=mysqli_fetch_array($sql,1);
            $_SESSION['username']=$data['username'];
            header("location:dashboard.php");               
        }
        else             
            $error="Invalid username or password!";         
    }
?>

我在这里做错了什么？

Answer 1

更改

$password=$_POSt['password'];

到

$password=$_POST['password'];