How to use * and %

You could replace "*" and "%" with let's say "{ASTERISK}" and "{PERCENT}" at the begining, before you start censoring, and at the end, when outputing, convert them back to the orignial characters, just an idea :)

And also, in this functions...

<?php
function attach_beginning($stem, $beginning, $replacement)
{
return $beginning.$stem;
}
?>

The $replacement argument is not used, just a heads up.

I'll look into a way to put literal characters (maybe that, if I'm feeling lazy =)..). I rolled this for my own chat months ago, so I didn't bother putting in anything I didn't need.

I'll look into that too. It was something I tossed in for future's sake when I was releasing this class.