Welcome to the Cookbook

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As stated in the introduction, the AppController class is the parent class to all of your application's controllers. AppController itself extends the Controller class included in the CakePHP core library. As such, AppController is defined in /app/app_controller.php like so:

<?php
class AppController extends Controller {
}
?>

1. <?php
2. class AppController extends Controller {
3. }
4. ?>

Controller attributes and methods created in your AppController will be available to all of your application's controllers. It is the ideal place to create code that is common to all of your controllers. Components (which you'll learn about later) are best used for code that is used in many (but not necessarily all) controllers.

While normal object-oriented inheritance rules apply, CakePHP also does a bit of extra work when it comes to special controller attributes, like the list of components or helpers used by a controller. In these cases, AppController value arrays are merged with child controller class arrays.

Remember to add the default Html and Form helpers, if you define var $helpers in your AppController

Please also remember to call AppController's callbacks within child controller callbacks for best results:

function beforeFilter(){
	parent::beforeFilter();
}

1. function beforeFilter(){
2. parent::beforeFilter();
3. }