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In this function you can alter existing or give new variables to every theme function.
In this example the theme_page variables are altered. Here we have a product page and this page needs another template file to be loaded. We alter $vars['template_file'] and if the test is true the page-product.tpl.php file will be loaded.
We also create new variables $vars['serviceMenu' and $vars['mainMenu'] which can be used in the page.tpl.php files as $mainMenu and serviceMenu.

<?php
function  _phptemplate_variables($hook, $vars) {
  switch($hook) {
    case 'page' :

We have build a modules with a lot of strings. We want to translate them. We dont want to search for strings, translate them and submit them using drupals locale interface because it would take hours.
Here is what we'll do. Enable your locale module which is a core module.

To translate exposed filter labels, go and get the theme_views_display_filters function out of the views.module file. Put it in your template.php file. Make sure that around every label a t function is wrapped. And that's it, go to admin/setting/locale, look up the string and translate it into the other language. (Dont forget to surf one time to the page you want to translate)

Is this happening to you when you're using the image module trying to submit an image node? Than the problem is probably the workflow module. Those two modules conflict with each other especially when a state is changed from published to unpublished. Turn off your workflow module and you'll see the problem disappear.