Workerman is a high-performance PHP asynchronous network programming framework for real-time communication and high-concurrency processing scenarios. Security protection is an important part of any application design. Workerman's security protection implementation methods mainly include the following. The following will introduce in detail and provide code examples.

1. Prevent SQL Injection

SQL injection means that an attacker injects malicious SQL code into an application to perform illegal operations on the database or obtain sensitive information. In Workerman, we can use PDO prepared statements to prevent SQL injection attacks. That is, use ? placeholders in the program to replace parameters in dynamically spliced ??SQL statements.

The following is a sample code using PDO prepared statements:

<?php
    //連接數(shù)據(jù)庫(kù)
    $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
    //準(zhǔn)備SQL語(yǔ)句，使用?作為占位符
    $stmt = $dbh->prepare('SELECT * FROM user WHERE username = ? AND password = ?');
    //執(zhí)行SQL語(yǔ)句，傳入?yún)?shù)數(shù)組
    $stmt->execute(array($username, $password));
    //遍歷結(jié)果集
    while ($row = $stmt->fetch()) {
        //處理數(shù)據(jù)
    }
?>

2. Preventing XSS attacks

Insert malicious script code into the system to steal or tamper with users' sensitive information. In Workerman, we can use the htmlentities() function to escape all special characters entered by the user into HTML entities, thus preventing malicious script code from being executed.

The following is a sample code using the htmlentities() function:

<?php
    function safe_echo($text) {
        return htmlentities($text, ENT_QUOTES, 'UTF-8');
    }
    //輸出用戶輸入的內(nèi)容
    echo "Your comment: " . safe_echo($_POST['comment']);
?>

3. Preventing CSRF attacks

A CSRF attack occurs when an attacker exploits user browsing The authentication mechanism of the server is used to submit malicious requests to the application, thereby impersonating the user's identity to perform illegal operations. In Workerman, we can use token verification to prevent CSRF attacks. That is, a randomly generated token is added to each form, and you need to verify whether the token is correct when submitting the form. If the token is incorrect, the request is rejected.

The following is a sample code using token verification:

<?php
    session_start();
    //生成隨機(jī)token
    $token = md5(rand());
    //將token保存到session中
    $_SESSION['token'] = $token;
    //在表單中添加token
    echo '<form method="post" action="submit.php">';
    echo '<input type="hidden" name="token" value="' . $safe_token . '" />';
    //其他表單控件
    echo '</form>';
    //處理表單提交
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
        //驗(yàn)證token是否正確
        if ($_POST['token'] !== $_SESSION['token']) {
            //token不正確，拒絕請(qǐng)求
            die('Invalid token');
        }
        //其他表單數(shù)據(jù)處理
    }
?>

The above is an introduction to the security protection implementation method and code examples in the Workerman document. I hope it can help developers better protect application security. .

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