What are some alternative methods in PHP for handling forum codes in a guestbook besides str_replace() and preg_replace()?

When handling forum codes in a guestbook, one alternative method in PHP is to use the `htmlspecialchars()` function to convert special characters to HTML entities. This helps prevent any malicious code injection and ensures that the forum codes are displayed properly without interfering with the guestbook layout.

// Example code snippet using htmlspecialchars() to handle forum codes in a guestbook
$guestbookEntry = "<b>Hello</b> [quote]Quoted text[/quote]";
$cleanEntry = htmlspecialchars($guestbookEntry);
echo $cleanEntry;