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Component Code

Component Class:

<?php 
class FallbackComponent extends Object
{
    function startup(&$controller)
    {
        $allowed_methods = get_class_methods($controller);
        if (!$allowed_methods) $allowed_methods = array();
        if (!in_array($controller->action, $allowed_methods))
        {
            if (isset($controller->defaultAction) && method_exists($controller, $controller->defaultAction))
            {
                echo $controller->{$controller->defaultAction}();
                exit(); // To prevent double rendering
            }
        }

    }
}
?>

Controller code

Add to your controller:

Controller Class:

<?php 
var $components = array('Fallback');
var $defaultAction = 'myDefaultAction';

function myDefaultAction()
{
echo 'I\'m a default action. I was called because nobody else answered the call...'
}
?>

What happens

If your controller is called with a non-existent action, then the component will look for a variable called 'defaultAction'. If found, it will look for a function in your controller with the name specified within that variable and call it if it exists.

Note

This example is pretty stripped down and can probably be done in a better way. If anyone fancies posting a more complete example, feel free to update this.