php MVC -Command

<?phpabstract class Command {		final function __construct() {	}	function execute(HttpRequest $request) {		$this->doExecute($request);	}	abstract function doExecute(HttpRequest $request) ;}public class HttpRequest {		private $properties;	private $feedback = array();		function __construct() {		$this->init();	}		function init() {		if (isset($_SERVER['REQUEST_METHOD'])) {			$this->properties = $_REQUEST;			return;		}		foreach($_SERVER['argv'] as $arg) {			if (strpos($arg,'=')) {				list($key,$val) = explode("=", $arg);				$this->setProperty($key,$val);			}		}	}	function getProperty($key) {		if (isset($this->properties[$key])) {			return $this->properties[$key];		}	}	function setProperty($key,$val) {		$this->properties[$key] = $val;	}	function addFeedback($msg) {		array_push($this->feedback, $msg);	}	function getFeedback() {		return this->feedback;	}	function getFeedbackString($separator = "\n") {		return implode( $separator,$this->feedback) ;	}}?>