What is the best way to limit the number of consecutive line breaks in a PHP guestbook?

To limit the number of consecutive line breaks in a PHP guestbook, you can use a regular expression to replace multiple consecutive line breaks with a single line break. This can help prevent excessive spacing in the guestbook entries.

// Assuming $guestbookEntry contains the guestbook entry text
$guestbookEntry = preg_replace("/(\r\n|\r|\n){3,}/", "\n\n", $guestbookEntry);