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Drupal 6 Technical Overview 0.3
Drupal 6 Technical Overview Whats Missing? Blocks Regions Rules Triggers Tokens Actions Drupal is a large framework, there are some concepts that are not expressed in this diagram. How does a hook work? Responding To A Hook Writing Hooks Hooks allow you to execute code at various points in the drupal program execution. Modules can 'write hooks' that you can hook into (respond to). The abililty for module authors to both write and respond to hooks allows modules to build off of each other and hilights drupals extensibility and community levearge. What's a hook? The basic struture of a hook is a for loop that checks for the existence of a series of function names based on a list of module names and the desired hook name, and calls any functions that match. A developer can implement a hook loop at any point in their code. http://api.drupal.org/api/function/module_implements/6 http://api.drupal.org/api/function/module_hook/6 Drupal is full of hooks, which are special function names that you can write into your module. Drupal will look for the function name of each hook, and if it finds one, execute it. This allows you to "hook into" any point in the script execution to modify objects and change what happens. Any module can respond to a hook that has been written by another module. http://api.drupal.org/api/function/hook_form_alter Model View The controller is index.php, the entry point into the framework. Where's the controller? Model Concepts View Concepts module hook weight system table form array #attributes #weight #title #id system table wieght column template devel_themer $vars[] preprocess_node theme()
This prezi visually shows how Drupal's conceptual framework is structured.
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