[development] module_preprocess_hook not always called
merlin at logrus.com
Tue Jul 29 16:37:34 UTC 2008
Matt Connolly wrote:
> No. My question is WHY?
For one, you really can't use the preprocessors with a theme function.
With a template, you get a nice handy box of variables and you can do
what you want with it. With a theme function, you get the variables that
were defined, and that's it. Sure, theoretically you could massage those
X variables a bit.
The real reason, though, is performance. Templates take up to five times
as long to run as theme functions; and Drupal has a couple of places
where a single theme function might be called fifty or a hundred times
on a page.
This is discussed here: http://drupal.org/node/173880 and there is
another mention of it here in the module developer's guide where we
discuss that side of using the theme layer: http://drupal.org/node/165706
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