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php - 登录功能无效

问题描述

如果用户名和密码都正确，我有一个登录表单，可以成功登录站点上的用户。但是，如果这些凭据中的任何一个是错误的或为空的，它会将我重定向到空白页面 custom_functions.php 。它不会验证我的用户名和密码，它应该是。任何帮助表示赞赏。这是我的代码。

登录.php

<!DOCTYPE HTML>
<html lang="en">

<head>
<meta charset="utf-8">
<title>Welcome to Love Her Feet</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="/login_assets/css/style.css">
<link href="https://fonts.googleapis.com/css?family=Raleway:300,400,500&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Open+Sans:400,600&display=swap" rel="stylesheet">
<link rel="stylesheet" href="/login_assets/css/media.css">
<script src="/login_assets/js/jquery.min.js"></script>
<script src="/login_assets/js/modernizr.custom.js"></script>
</head>

<body>
<header class="clear hBlack">
    <div class="jLogo"><a href="/"><img src="/login_assets/images/logo.png" alt=""></a></div>
</header>
<div class="logArea clear">
    <form action="custom_functions.php" method="post" enctype="application/x-www-form-urlencoded">
    <div class="logbox">
    <div class="box clear">
        <h2>Members Area</h2>
        <div class="logTypes">
        <input type="text" name="username" class="logtextbox" placeholder="Username or email">
        <span class="text-danger"><?php echo $username_error;  ?></span>
        <input type="password" name="password" class="logtextbox" placeholder="Password"><br>
        <span class="text-danger"><?php echo $password_error;  ?></span>
        <!-- <input type="text" name="captcha" class="logtextbox" placeholder="Enter the code shown below"><br>
        <img style="margin: 0 auto;" src="captcha.php">
        <span class="text-danger"><?php echo $captcha_error;  ?></span> -->
        <div style="text-align: center">Remember my login: <input name="remember" type="checkbox"></div>
        </div>
    </div>
    <input type="submit" value="submit" class="logBtn" name="submit">
    </div>
    </form>
    <div class="logtext1">
    </div>
    <div class="logtext2">
    </div>
</div>
</div>
<footer class="clear">
    <p class="fNav"><a href="/">Home</a><span>|</span>
    <a href="/">Log Out</a>
    </p>
</footer>
</body>

</html>

custom_functions.php

<?php

function validation($form_data)
{
    $form_data = trim(stripcslashes(htmlspecialchars($form_data)) );
    return $form_data;
}

if ($_SERVER['REQUEST_METHOD'] == "POST"){
    if(isset($_POST["submit"])) {
        login_function();
    }
}

function login_function() {

    session_start();
    require 'connection.php';

    $username_error = "";
    $password_error = "";

    $v_username = $_POST['username'];
    $v_password = $_POST['password'];

    $username = validation($v_username);
    $password = validation($v_password);

    $remember = isset($_POST['remember']);

    if(empty($username))
    {
        $username_error = "<p>Please enter your username!</p>";
    }

    if(empty($password))
    {
        $password_error = "<p>Please enter your password!</p>";
    }

    if(!empty($username) && !empty($password)) {
        $sql = "SELECT * FROM member_auth WHERE username = :username";

        $stmt = $pdo->prepare($sql);

        $stmt->bindValue(':username', $username);

        $stmt->execute();

        $user = $stmt->fetch(PDO::FETCH_ASSOC);

        $cryptpass = $user['cryptpass'];

        if($user === false){
            $username_error = "<p>User doesn't exist</p>";
        }   elseif($user) {
            $newPass = crypt($password, $cryptpass);
                if($cryptpass == $newPass) {
                    $_SESSION['loggedin'] = TRUE;
                    $_SESSION['username'] = $username;
                    if($remember == "on") {
                        setcookie("remember", $username, time()+3600);
                    }
                    header('Location: login_success.php');
                } else {
                    $password_error = "<p>Password is not correct!</p>";
                }
            }
    }
}

?>

login_success.php

<?php

session_start();

if(isset($_SESSION["loggedin"]) || $_COOKIE["remember"]) {
    echo "Welcome, {$_SESSION["username"]} <br>";
    echo "<a href='logout.php'>Logout</a>";
} else {
    header("Location: login.php");
}

标签： phpvalidation

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