daktylos/libs/NullAction.class.php

<?php
class NullAction implements IAction {
	private $action;
	public function __construct($action) {
		$this->attemptedAction = $action;
	}

	public function execute() {
		header("HTTP/1.0 404 Not Found");
		return array("error" => "API action '".$this->attemptedAction."' not found.");

	}
}