Highlight code/syntax?

[LemonInflux]

Ok, I've seen this on many sites, including this one. Where you have a code (say, PHP), and different commands and functions are coloured in different ways. An example:

 

<?php
echo 'text';
?>

 

Various colours are used to highlight different parts of the code. I've tried google'ing it, but I found nothing. Anyone know how to do it?

[marcus]

<?php
highlight_file("filename.ext");
?>

[Jessica]

you'd probably want to use highlight string in this case, but either would work