dedecms攻击

// 示例代码：使用PDO防止SQL注入
$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username AND password = :password');
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

// 示例代码：防止XSS攻击
function escape($string) {
    return htmlspecialchars($string, ENT_QUOTES | ENT_HTML5, 'UTF-8');
}

$username = escape($_GET['username']);
echo "Hello, " . $username . "!";

// 示例代码：防止文件上传漏洞
if (isset($_FILES['file'])) {
    $file = $_FILES['file'];
    $allowedTypes = ['image/jpeg', 'image/png', 'application/pdf'];
    if (in_array($file['type'], $allowedTypes)) {
        $uploadPath = '/uploads/' . basename($file['name']);
        if (move_uploaded_file($file['tmp_name'], $uploadPath)) {
            echo 'File uploaded successfully!';
        } else {
            echo 'Failed to upload file.';
        }
    } else {
        echo 'Invalid file type.';
    }
}