March 7, 2017

A Study in String Processing Languages by Paul Klint

By Paul Klint

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The chapter finishes up by examining how to override, add, and delete existing menu items, so you can customize Drupal as nonintrusively as possible. Callback Mapping When a web browser makes a request to Drupal, it gives Drupal a URL. From this information, Drupal must figure out what code to run and how to handle the request. This is commonly known as dispatching. Drupal trims off the base part of the URL and uses the latter part, called the path. q=node/3, the Drupal path is node/3. Mapping URLs to Functions The general approach taken is as follows: Drupal asks all its modules to provide an array of menu items—that is, a path and some information about that path.

The components that make up the web page serving process will be covered in detail in later chapters. fm Page 11 Friday, March 30, 2007 10:36 AM CHAPTER 2 ■■■ Writing a Module I n many open source applications, you can customize the application by modifying the source code. While this is one method for getting the behavior you desire, it is generally frowned upon and considered a last resort in the Drupal community. Customizing code means that with each update of Drupal, you must perform more work—you must test to see that your customization still works as expected.

The next directive, #default_value, will be the default value for this form element. , there is more than one check box), the value for #default_value will be an array. The value of #default_value is worth discussing: variable_get('annotate_nodetypes', array('story')) Drupal allows programmers to store and retrieve any value using a special pair of functions: variable_get() and variable_set(). The values are stored to the variables database table and are available anytime while processing a request.

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