The template.php file contains your sub-theme's functions to manipulate Drupal's default markup. It is one of the most useful files when creating or modifying Drupal themes. With this file you can do three things: Modify any theme hooks variables or add your own variables, using preprocess or process functions. Override any theme function. That is, replace a module's default theme function with one you write. Call hook_ * _alter ( ) functions which allow you to alter various parts of Drupal's internals, including the render elements in forms. The most useful of which include hook_form_alter ( ) , hook_form_FORM_ID_alter ( ) , and hook_page_alter ( ) . See api.drupal.org for more information about _alter functions.
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