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App::import('Controller', 'MyController');

Calling App::import is equivalent to require'ing the file. It is important to realize that the class subsequently needs to be initialized.

<?php
// The same as require('controllers/users_controller.php');
App::import('Controller', 'Users');

// We need to load the class
$Users = new UsersController;

// If we want the model associations, components, etc to be loaded
$Users->constructClasses();
?>

1. <?php
2. // The same as require('controllers/users_controller.php');
3. App::import('Controller', 'Users');
4. // We need to load the class
5. $Users = new UsersController;
6. // If we want the model associations, components, etc to be loaded
7. $Users->constructClasses();
8. ?>

App::import('Model', 'MyModel');

App::import('Component', 'Auth');

<?php
App::import('Component', 'Mailer');

// We need to load the class
$Mailer = new MailerComponent();

?>

1. <?php
2. App::import('Component', 'Mailer');
3. // We need to load the class
4. $Mailer = new MailerComponent();
5. ?>

App::import('Behavior', 'Tree');

App::import('Helper', 'Html');