http://claylo.com/2006/09/24/php-mimeviewer-for-trac/

You’re right — no dice with a default Trac, even 0.10rc1.

My notes are from a SilverCity-based PHP highlighting system, which I now realize is pretty uncommon.

A current Trac using php itself for syntax highlighting needs these rules:

.code-keyword { color: #007700; }
.code-lang { color: #0000BB; }
.code-comment { color: #FF8000; }
.code-string { color: #DD0000; }

… even those, however, are imperfect, as Trac’s “Deuglifier” that splits HTML into the row-numbered tables doesn’t catch the fact that PHP’s syntax highlighting output doesn’t mark each line … a multi-line comment only has opening and closing span tags surrounding the entire block, rather than a tag per line.

I’ll open up a ticket with Trac on that issue. In the meantime, the above rules are better than the defaults if you’re used to seeing PHP syntax coloring.