How to reset the theme registry

Update for D7:

drupal_flush_all_caches();

drupal_flush_all_caches() should work for just about anything. registry_rebuild() alone did not work in my tests.

Drupal 6

The Drupal function to reset the theme registry is drupal_rebuild_theme_registry (D6).

You can add it to your template.php while developing:

<?php
drupal_rebuild_theme_registry();
?>

Adding it to template.php works, of course, even if where you're altering the theme registry (and need to see it reset) is from work you're doing on a module.

Remember to take it out again!

Installing devel module and using its reset cache function is probably easier and definitely better practice.

Resolution