PHP和Vue.js开发安全性最佳实践：防止恶意攻击方法

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

if (empty($username) || empty($password)) {
    echo "用户名和密码不能为空！";
    die();
}

// 其他验证逻辑...

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

$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

// 处理查询结果...

<div id="app">
    <span v-html="message | sanitize"></span>
</div>

<script>
    Vue.filter('sanitize', function(value) {
        // 过滤value中的恶意标签和脚本代码
        // 返回过滤后的value
    });

    var app = new Vue({
        el: '#app',
        data: {
            message: '<script>alert("恶意代码");</script>'
        }
    });
</script>

session_start();

// 生成Token
$token = bin2hex(random_bytes(16));
$_SESSION['token'] = $token;

// 在表单中添加Token
echo '<form action="process.php" method="post">';
echo '<input type="hidden" name="token" value="' . $token . '">';
echo '<input type="text" name="username">';
echo '<input type="password" name="password">';
echo '</form>';

// 验证Token
if ($_POST['token'] !== $_SESSION['token']) {
    echo "无效的请求！";
    die();
}

// 处理表单数据...

$allowedExtensions = ['jpg', 'png', 'gif'];
$maxFileSize = 2 * 1024 * 1024; // 2MB

$filename = $_FILES['file']['name'];
$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
$filesize = $_FILES['file']['size'];

if (!in_array($extension, $allowedExtensions)) {
    echo "不支持的文件类型！";
    die();
}

if ($filesize > $maxFileSize) {
    echo "文件太大！";
    die();
}

// 其他处理逻辑...