PHP: Hypertext Preprocessor (PHP) is a popular interpreted programming language that is especially suited for web development. Drupal core and all contributed modules are written in PHP.

Taxonomy in Drupal provides a way to classify your site’s content. Taxonomy vocabularies are created with terms within those vocabularies.

To ensure that your site and its modules continue to function correctly, a set of administrative operations should be performed periodically. These operations are referred to as cron tasks. Examples of cron tasks are: checking for module and theme updates, indexing content for search, or cleaning up temporary files.

Drupal provides a standard, secured method for module developers to add forms to a Drupal website. Learn how to use the Form API to build, validate, and submit a custom form.