http://sf2010.drupal.org/conference/sessions/page-render-drill-down-drupal-7

Join Moshe Weitzman for deep dive into the page render system for Drupal 7. We'll learn how to build and theme a standard page callback. Then we'll evaluate various alternatives for modifying the page, to meet some hypothetical user experience requirements. Learn more about:

1. Build a drupal_render() array in a menu callback. Learn to differentiate between key properties such as #type, #theme, #theme_wrappers, #pre_render, ...
   
2. Change the $page during hook_page_alter(). Move some blocks, alter text, etc.
   
3. Make changes during the preprocess and process stages of page themeing
   
4. Use theme_hook_suggestions to route themeing to alternate templates and theme functions.
   
5. Alter the theme registry for hostile takeover of theme hooks.
   

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