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I have a Drupal 7 theme which is a Bootstrap child theme.

In my version of page.vars.php, I have a THEME_page_alter() call which runs only once until I do a clear cache. Other hooks such as THEME_process_page or THEME_preprocess_page are called each time I reload the page.

A second theme, with the same page_alter hook works just fine and is called each page-reload without the need for a clear-cache first.

What could be causing this?

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  • Are the 2 themes tested on the same site?
    – Jimmy Ko
    Commented Dec 19, 2016 at 14:44
  • Yes, they are on a multi-domain setup, but all running from the same Drupal instance.
    – Alexander Holsgrove
    Commented Dec 19, 2016 at 15:20
  • I suspect it is due to the page cache...
    – Jimmy Ko
    Commented Dec 19, 2016 at 16:21
  • Why would the output change though? Surely it would cache the same result as the first run?
    – Alexander Holsgrove
    Commented Dec 19, 2016 at 16:43
  • As I remember, rendering array is cached if you enable page cache. But preprocess function still work because the cache is made before the preprocess function.
    – Jimmy Ko
    Commented Dec 19, 2016 at 17:17

1 Answer 1

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Theme settings are specific to each theme. Go to /admin/appearance/settings/yourtheme and check for any theme-specific caching options. I can't tell you exactly what the options would be because that depends on your theme.

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  • I couldn't see anything of relevance in there. The thing is that the logic that runs the first time around in THEME_page_alter() works correctly, but then it's not like it caches the correct logic on the subsequent page load. It seems to not run at all, and displays a region that I specifically want to hide (unset)
    – Alexander Holsgrove
    Commented Dec 19, 2016 at 15:23

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