[kh99]

Oh, OK. I think what you can do is change that code to use a callback like this:

			// [SIZE=XXX]
			$tag_list['option']['size'] = array(
				'callback' => 'handle_bbcode_size',
				'option_regex' => '#^[0-9\+\-]+$#',
				'strip_empty' => true
			);

Then write a function called handle_bbcode_size that takes the size number 1-7 as a parameter and returns the replacment html. That way you can write whatever php you want to do the conversion. (Edit: I think the function actually takes two parameters, the text between the tags and the font size number).

BTW, I haven't tried it, and looking at the other tags that have a callback I notice none of them have an option_regex so I don't know if that works with a callback or not.