Ok, I mentioned this in twitter a few weeks ago, I created an issue about it in D7’s issue queue, and there are 2 small print notes in the D6 theme guide, but I don’t think my message was visible enough. So let me just say for the record (again)…
Never, never, ever, ever use
phptemplate_ as the prefix for your theme’s preprocess functions. Don’t do it! phptemplate_ prefix should talk to the hand! Expunge it from your memory. It’s an ex-prefix. Seriously, cut it out! So, let me re-phrase:
Every time you use phptemplate_ prefix,
God adds a pointless issue to Drupal’s issue queue.
Please, think of the issue queue!