PHP security protection and attack prevention in mini program development

PHP security protection and attack prevention in mini program development

With the rapid development of the mobile Internet, mini programs have become an important part of people's lives. As a powerful and flexible back-end development language, PHP is also widely used in the development of small programs. However, security issues have always been an aspect that needs attention in program development. This article will focus on PHP security protection and attack prevention in small program development, and provide some code examples.

1. XSS (cross-site scripting attack) prevention

XSS attack means that hackers inject malicious script code into web pages, causing the user's browser to execute these malicious script codes, thus achieve the purpose of attack. In order to prevent XSS attacks, we can use PHP's built-in function htmlspecialchars to escape the data entered by the user.

The sample code is as follows:

$userInput = $_GET['user_input'];
$escapedInput = htmlspecialchars($userInput);
echo $escapedInput;

2. CSRF (cross-site request forgery) prevention

CSRF attack refers to a hacker forging the logged-in identity of a user. Trick the user into performing an operation without their knowledge, thereby achieving the purpose of the attack. In order to prevent CSRF attacks, we can use PHP's built-in functions session_start() and csrf_token to generate a token and verify the token every time an important operation is initiated.

The sample code is as follows:

session_start();
if (empty($_SESSION['csrf_token'])) {
    $_SESSION['csrf_token'] = md5(uniqid(mt_rand(), true));
}
$csrfToken = $_SESSION['csrf_token'];

// 显示表单
echo '<form action="submit.php" method="post">';
echo '<input type="hidden" name="csrf_token" value="' . $csrfToken . '">';
echo '<input type="submit" value="提交">';
echo '</form>';

// 提交表单时验证令牌
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ($_POST['csrf_token'] !== $csrfToken) {
        die('CSRF攻击');
    }
    // 其他处理逻辑
}

3. SQL injection prevention

SQL injection means that hackers insert malicious SQL code into user input, thereby Get, modify or even delete data in the database. In order to prevent SQL injection, we can use PHP's built-in function mysqli_real_escape_string to escape the data entered by the user.

The sample code is as follows:

$db = mysqli_connect('localhost', 'user', 'password', 'database');
if (mysqli_connect_errno()) {
    die('数据库连接失败');
}

$userInput = $_GET['user_input'];
$escapedInput = mysqli_real_escape_string($db, $userInput);

$query = "SELECT * FROM users WHERE username='$escapedInput'";
$result = mysqli_query($db, $query);
while ($row = mysqli_fetch_assoc($result)) {
    // 处理查询结果
}
mysqli_close($db);

To sum up, in the development of small programs, the security protection and attack prevention of PHP are very important. This article gives some sample codes for security prevention from three aspects: XSS, CSRF and SQL injection. However, security protection is a continuous process, and developers also need to pay close attention to current security threats and take appropriate precautions in a timely manner according to the situation. I hope the content of this article can bring some help to small program developers.

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