Stuff

<?php
error_reporting(E_ALL);

// Superclass for determining action - in realite this holds a whole bunch of other shared functions as well.
abstract class superclass {
	var $validActions = array();
	
	function determineAction($action='') {
		echo 'Determining Action...<br />';
		if(!in_array($action,$this->validActions)) {
			$this->invalidAction();
		} elseif(method_exists($this,$action)) {
			$this->$action();
		} elseif(method_exists($this,'defaultAction')) {
			$this->defaultAction();
		} else {
			die('Geen default action ingesteld voor deze klasse!');
		}
	}
}

// Extends super with actions and other functions. Only actions should be allowed to be called through determineAction
class subclass extends superclass {
	var $validActions = array('showPage','destroyDatabase');
	
	function showPage() {
		echo 'Hier een actie van subclass genaamd showPage...<br />';
	}
	
	function destroyDatabase() {
		echo 'Database wissen mislukt, probeer het via Enterprise Manager!<br />';
	}

	function defaultAction() {
		echo 'De defaultAction van subclass...<br />';
	}
}

class wrongsubclass extends superclass {
	function showPage() {
		echo 'Foute subklasse laat van zich horen...<br />';
	}
}

$test = new subclass();
$test->determineAction('Foo'); // Action does not exist, should show subclass::defaultAction
$test->determineAction('showPage'); // Does exist, should show subclass::showPage
$test2 = new foutesubclass();
$test2->determineAction('Foo'); // Doesn't exist, missing defaultAction
?>