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My objective: get and change the breadcrumb within a custom module.

So it's possible that template_preprocess_HOOK is not even the best tool to be using for this, please mention that.

My question, though, is what HOOK to use? Should it be called template_preprocess_mymodule or template_preprocess_mytheme?

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2 Answers 2

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The HOOK corresponds to the theme function or template you are preprocessing.

If you wanted to alter page.tpl.php, you would use function MYTHEME_preprocess_page(&$variables).

If you wanted to alter theme_item_list(), you would use function MYTHEME_preprocess_item_list(&$variables).

A note, any dashes should be converted to underscores.

So views-view.tpl.php would be altered by function MYTHEME_preprocess_views_view(&$variables).

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  • When I do that, I get WSOD. My function is called rescue_preprocess_views-view--testtaxo().
    – beth
    Commented Jul 9, 2012 at 15:31
  • Check your PHP error log to find out what is causing the WSOD. It is possible you have a php syntax error within your preprocess function.
    – sheena_d
    Commented Jul 9, 2012 at 15:42
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    your function name can't have -'s in it: PHP is thinking you are trying subtraction :)
    – Jimajamma
    Commented Jul 9, 2012 at 15:45
  • The question was about using 'template_preprocess_HOOK()'.
    – Hermann Schwarz
    Commented Dec 1, 2021 at 15:09
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Assuming your template file for breadcrumb menu is my-breadcrumb.html.twig. So you can override variables in this template by defining template_preprocess_my_breadcrumb(&$variables) in a module.

Or you can also use MYTHEME_preprocess_my_breadcrumb(&$variables) in your YOUTHEME.theme

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