小编hen*_*.io的帖子

我有一个愚蠢的问题,我无法弄清楚.当我刷新我的登录页面时,密码和用户名出现在输入字段中.这是我的代码:

<?php include_once "includes/scripts.php"; ?>
<?php
session_start();
include_once ("includes/connect.php");
if (isset($_SESSION['logged_in'])) {
    header('location: admin_cms.php');
}else{
    if (isset($_POST['username'], $_POST['password'])){
        $username = $_POST['username'];
        $password = md5($_POST['password']);
        if (empty($username) or empty($password)){
            $error = '<p>NOTE: Fields are blank</p>';   
        }else{
            $query = $pdo->prepare("SELECT * FROM users WHERE user_name = ? AND user_password =?");
            $query->bindValue(1, $username);
            $query->bindValue(2, $password);
            $query->execute();
            $num = $query->rowCount();
            if ($num == 1){
                $_SESSION['logged_in'] = true;
                header('location: admin_cms.php');
                exit();
            }else{
                $error = "<p>NOTE: The username or password is incorrect</p>";  
            }
        }
    }
    ?> …