Hooks in Drupal allows modules to interact with the Drupal core. Drupal’s module system is BASED on the concept of “hooks”. A hook is a PHP function that is named foo_bar(), where “foo” is the name of the module and “BAR” is the name of the hook. Each hook has a defined set of parameters and a SPECIFIED result type. To extend Drupal, a module need SIMPLY implement a hook. When Drupal WISHES to allow intervention from modules, it determines which modules implement a hook and calls that hook in all enabled modules that implement it.

Hooks in Drupal allows modules to interact with the Drupal core. Drupal’s module system is based on the concept of “hooks”. A hook is a PHP function that is named foo_bar(), where “foo” is the name of the module and “bar” is the name of the hook. Each hook has a defined set of parameters and a specified result type. To extend Drupal, a module need simply implement a hook. When Drupal wishes to allow intervention from modules, it determines which modules implement a hook and calls that hook in all enabled modules that implement it.