What are some best practices for maintaining a clean guestbook in PHP forums, considering the limitations of spam prevention methods?

Spam prevention methods in PHP forums can be limited in effectiveness, leading to an accumulation of spam in the guestbook. To maintain a clean guestbook, it is advisable to implement a combination of CAPTCHA verification, user moderation, and automated spam detection algorithms. 

// Example PHP code snippet for maintaining a clean guestbook in a forum

// Implement CAPTCHA verification
function validateCaptcha($input) {
    // Your CAPTCHA verification logic here
}

// User moderation
function allowPost($userRole) {
    // Check user role and allow post if user is trusted
}

// Automated spam detection algorithm
function detectSpam($content) {
    // Your spam detection algorithm here
}

// Example usage
$userInput = $_POST['guestbook_entry'];
if(validateCaptcha($_POST['captcha']) && allowPost($userRole) && !detectSpam($userInput)) {
    // Save the guestbook entry to the database
} else {
    // Display an error message or block the submission
}

Keywords

SQL injection CAPTCHA honeypot Akismet IP address filtering

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