replacing html code

How could I make <div class="code"> replace HTML code to it's text equivalent? Like, < to <? Is there any CSS way to do it? And if not, how could I possibly go about doing it?

Not really sure what you mean but if you type &lt ; in the source it represents the < character if someone was to view the website they would see the special character and not the character code, subsequently &gt ; in the source represents the > character.

However, if you want a replacment script you can use PHP's highlight_string function quite easily to echo a piece of code to the browser window, that is, assuming you have access to php...

But to answer your original question, CSS controls formatting only, you can't use it like a scripting language.

Is there any way to trigger php from simply typing <div class=code> ? Because the website that does it, I checked their stylesheet and it didn't have anything special on it. So I'm wondering how they managed to trigger php from people typing the css code.

Well, you wouldn't see the scripting becuase that's dealt with by the server and displayed as html to the end user.

PHP = Hypertext Preprocessor. Meaning that the script is processed and served as html.

If you are looking for a style changing script I'm certain you would be able to find one using any of the scripting languages that you have access to via google.

Here is an example of a highlighting script in php

http://ca3.php.net/manual/en/functi...ight-string.php