Writing a Module

Summary

After reading this chapter, you should be able to perform the following tasks:

• Create a Drupal module from scratch.

• Understand how to hook into Drupal’s code execution.

• Store and retrieve module-specific settings.

• Create and process simple forms using Drupal’s forms API.

• Create a new administrative category on Drupal’s main administration page.

• Define a form for the site administrator to choose options using check boxes, text input fields, and radio buttons.

• Validate settings and present an error message if validation fails.

• Understand how Drupal stores and retrieves settings using the built-in persistent variable system.