What are some best practices for handling spam in a guestbook using PHP?

Spam in a guestbook can be handled by implementing CAPTCHA verification to ensure that only real users are submitting entries. This can help prevent automated spam bots from filling the guestbook with unwanted content. 

// Check if the CAPTCHA code is valid
if(isset($_POST['captcha']) && $_POST['captcha'] == $_SESSION['captcha']) {
    // Process the guestbook entry
    // Add entry to database or file
} else {
    // Display an error message for invalid CAPTCHA
    echo "Invalid CAPTCHA code, please try again.";
}

Keywords

spam guestbook PHP filtering validation

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