PHP syntax highlighting

Since no existing tool satisfied my needs, I wrote my own. Lo and behold:

Hyperlight

Usage is extremely easy: just use

 <?php hyperlight($code, 'php'); ?>

to highlight code. Writing new language definitions is relatively easy, too – using regular expressions and a powerful but simple state machine. By the way, I still need a lot of definitions so feel free to contribute.

[I marked this answer as Community Wiki because you're specifically not looking for Javascript]

http://softwaremaniacs.org/soft/highlight/ is a PHP (plus the following list of other languages supported) syntax highlighting library:

Python, Ruby, Perl, PHP, XML, HTML, CSS, Django, Javascript, VBScript, Delphi, Java, C++, C#, Lisp, RenderMan (RSL and RIB), Maya Embedded Language, SQL, SmallTalk, Axapta, 1C, Ini, Diff, DOS .bat, Bash

It uses <span class="keyword"> style markup.

It has also been integrated in the dojo toolkit (as a dojox project: dojox.lang.highlight)

Though not the most popular way to run a webserver, strictly speaking, Javascript is not only implemented on the client-side, but there are also Server-Side Javascript engine/platform combinations too.