Should I declare the usage of a new template.php file?

I created a template.php file, put the following function inside, saved, and flushed all Drupal cache. The desired change didn’t occur.

function garku_process_html(&$variables) {   $variables['styles'] = preg_replace('/.css?.*"/','.css"', $variables['styles']); } 

How should I declare the usage of a new template.php file in a Drupal 8 sub-theme?

I ask since I haven’t found anything about this in the documentation, for example in Overview of theme files.

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Should I declare the usage of a new template.php file?

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