July 2017
Intermediate to advanced
456 pages
11h 32m
English
Content preview from Mastering Drupal 8
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The role of the theme file in Drupal
Themes can be simple to compose, sometimes containing a single configuration file, a couple of Twig templates, and a few assets. However, there will be times when we need to intercept and override variables and data that Drupal outputs before they reach our Twig templates.
Drupal's API (https://api.drupal.org/api/drupal/8) allows us to create a *.theme file where we can add theme functions that can hook into the API using different types of function calls:
- Preprocess: This is a set of function calls specific to different templates that allow us to manipulate variables before they are output to the page
- Hooks: This is a set of function calls to hook into the Drupal API that allows us to alter variables ...
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