What are the potential risks of allowing unregistered users to comment on articles/news on a website using PHP?

Allowing unregistered users to comment on articles/news on a website using PHP can pose risks such as spam comments, inappropriate content, and security vulnerabilities. To mitigate these risks, it is important to implement measures such as captcha verification, content moderation, and input validation to ensure that only legitimate comments are posted on the website. 

// Example PHP code snippet to implement captcha verification for unregistered users commenting on articles/news

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $captcha = $_POST['captcha'];

    // Verify captcha code
    if ($captcha != $_SESSION['captcha_code']) {
        echo 'Invalid captcha code. Please try again.';
    } else {
        // Process comment submission
        // Code to insert comment into database
    }
}

Keywords

SQL injection Cross-site scripting (XSS) User authentication Data validation Input sanitization

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