PHP登录页面代码问题。登录页面加载消息显示无效登录

Question

每次在登录页面加载消息时显示登录无效。它不检查 if 条件直接转到 else。我回显了我的 sql 查询，它运行良好。但我不明白我在哪里犯了错误。你能帮帮我吗？

下面是我的代码，

<?php
    #$error = "";
        $servername = "localhost";
        $username = "";
        $password = "";
        $dbname = "lg_db";
        $tb_name = "lgin";

        mysql_connect("$servername", "$username", "$password")or die("Cannot connect");
        mysql_select_db("$dbname")or die("Cannot connect to Database");

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

        $sql="SELECT * FROM $tb_name WHERE Name='$username' and Password='$pass'";

        $result=mysql_query($sql);

        $count1=mysql_num_rows($result);

        if($count1 >=1)
        {
            session_start();
           $_SESSION['simple_login'] = $username;
            header("Location: index_new.php");
            exit();

        }else{
                 $error="Invalid Login";
        }
?>

Answer 1

感谢您的支持和帮助!我的问题得到解决。我在 if($_SERVER["REQUEST_METHOD"] == "POST") 之前添加了来自 html 文件的 POST 数据。