Hooks

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Allows modules to interact with the core Drupal. Modules are used in Drupal, work on the principle of «hook» (born hook - the hook, hook). Huck - is a PHP function, which is calling module_name_hook_name ( ) where «module_name» - the name of the module (file name module_name.module), and «hook_name» - the name of the hook. Each hook has a certain set of parameters and types of results. 
 
To extend the functionality of certain parts of Drupal, you need to implement the appropriate hook. When Drupal wants to interact with the modules, it determines what hooks available modules and calls these hooks for all included modules on the site.
The following are the hooks, a call which supports Drupal. In the definitions below, the word "hook" should be replaced in the name of the module in which the hook will be implemented. For example, if there is a module example.module and it is defined hook hook_help ( ) then the module implementing the hook should be defined as a function example_help ( )