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The beauty of adhering to these standards is that you can automatically generate documentation for your modules using the API contributed module. The API module is an implementation of a subset of the Doxygen documentation generator specification, tuned to produce output that best benefits a Drupal code base. You can see this module in action by visiting http://api.drupal.org, and you can learn more about the API module at http://drupal.org/project/api.

To force this error to display, run the MyStash application, and then close it. Go to the data model, add an attribute called foo to the Note entity, and then run the application again. The persistent store coordinator will be unable to open the data store, because the model no longer matches, and your new error message will display as in Figure 9-26.

Let s walk through the skeleton of a module from top to bottom and highlight the different types of documentation along the way. Before declaring functions, take a moment to document what the module does using the following format:

/* * Date validation pattern */ $pattern = "/(\d*)/"; foreach ( $date as $d ) { echo "<p>", preg_replace($pattern, "<em>$1</em>", $d), "</p>"; } /* * Output the pattern you just used */ echo "\n<p>Pattern used: <strong>$pattern</strong></p>"; > </body> </html>

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That s probably the best you can do to handle unexpected errors. The next section, however, talks about handling expected errors: validation errors.

/** * @file * One-line description/summary of what your module does goes here. * * A paragraph or two in broad strokes about your module and how it behaves. */

PHP constants should be in all capital letters, with underscores separating proper words. When defining PHP constants, it s a good idea to explain what they re going to be used for, as shown in the following code snippet: /** * Role ID for authenticated users; should match what's in the "role" table. */ define('DRUPAL_AUTHENTICATED_RID', 2);

If you ve configured any properties in your Core Data model with any validation parameters and you allow users to input values that don t automatically meet those validation parameters, you can expect to have validation errors. As you learned in 4, you can stipulate validation parameters on the properties of the entities in your data model. Validations ensure the integrity of your data; Core Data won t store anything you ve proclaimed invalid into the persistent store. Just because you ve created the validation rules, however, doesn t mean that users are aware of them, or even that they know that they can violate them. If you leave the Xcode-generated error handling in place, users won t know they ve violated the validation rules even after they input invalid data. All that will happen is that your application will crash, logging a long

After saving the preceding code, reload http://localhost/regex.php in your browser to see all numeric characters highlighted (see Figure 9-15).

Function documentation should use the following syntax: /** * Short description, beginning with a verb. * * Longer description goes here. * * @param $foo * A description of what $foo is. * @param $bar * A description of what $bar is. * @return * A description of what this function will return. */ function name_of_function($foo, $bar) { ... return $baz; } The short description should begin with an imperative verb in the present tense, such as Munge form data or Do remote address lookups (not Munges form data or Does remote address lookups ). Let s take a look at an example from Drupal core that is found within system.module:

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