What alternative methods can be used to implement design protection in PHP for a guestbook without using BB codes?

When implementing design protection in a guestbook without using BB codes, one alternative method is to sanitize user input to prevent any potentially harmful HTML or script tags from being executed. This can be done using PHP functions like htmlentities() or htmlspecialchars() to encode special characters. Additionally, limiting the length of user input and implementing a profanity filter can help maintain the integrity of the guestbook. 

// Sanitize user input to prevent harmful HTML or script tags
$user_input = htmlentities($_POST['user_input']);
// Limit the length of user input
$user_input = substr($user_input, 0, 255);
// Implement a profanity filter
$profanities = array('bad_word1', 'bad_word2', 'bad_word3');
$user_input = str_ireplace($profanities, '***', $user_input);

// Save sanitized user input to the database
// Example: $sql = "INSERT INTO guestbook (message) VALUES ('$user_input')";

Keywords

design protection PHP guestbook BB codes alternative methods

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