In D7, we have two copies of the same Bootstrap Agency base theme modified to show on different URLs using ThemeKey.

This works, but whenever a new module is installed, the site crashes and we see the following in the Apache error log:

PHP Fatal error: Cannot redeclare bootstrap_agency_preprocess_page() (previously declared in /sites/all/themes/bootstrap_agency_minimal/template.php:13) in /sites/all/themes/bootstrap_agency/template.php on line 13

This is actually a very similar issue to this , I just couldn't comment on the above and Clive's answer wasn't all that clear to me. Is it better to merge the two functions or rename one of them - as the 2nd answer suggests? And what does merging entail?

  • Is there a bootstrap_agency_preprocess_page function inside of template.php in bootstrap_agency_minimal/template.php?
    – Kevin
    Commented Jul 6, 2016 at 18:28

1 Answer 1


Function names in template.php have to be prefixed with themename_function. At the same time, you cannot have a function declared twice.

bootstrap_agency_preprocess_page() should exist once in bootstrap_agency/template.php, and the other should be bootstrap_agency_minimal_preprocess_page() in bootstrap_agency_minimal/template.php.

If you do not need to do any override, and the one theme is a subtheme, you can simply omit it from template.php. Otherwise, you would need to copy the function code in and amend what you need to amend.

  • Thanks, Kevin! We've already tried this is an experiment and it worked. Good to know it's a proper solution and hot a hack that would break something elsewhere.
    – dubesor
    Commented Jul 6, 2016 at 18:39

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