Refactoring to Factory Function in PHP

Message.php

<?php

/**
 * Message object class used to control when messages are output
 * @package Brilliantcoding
 */

/**
 * Message Class
 */
class Message {

	private $sendTime;
	private $text;

	/**
	 * Public constructor, sets class vars
	 * @param string $text The message to send
	 * @param time $scheduleTime Exact time to schedule message
	 * @param time waitDuration Time from now to send message
	 */
	public function __construct( $text, $scheduleTime, $waitDuration ) {
		if ( $scheduleTime ) {
			$this->sendTime = $scheduleTime;
		} else if ( $waitDuration ) {
			$this->sendTime = time() + $waitDuration;
		} else {
			$this->sendTime = time();
		}
		$this->text = $text;
	}

	/**
	 * Public send function, only sends if the sendTime has passed
	 *
	 * @return boolean, returns true if the message was sent
	 */
	public function send() {
		$is_sent = False;
		if ( $this->sendTime < time() ) {
			echo $this->text;
			$is_sent = True;
		}
		return $is_sent;
	}

}

RefactortoFactoryFunctioninPHP.php

<?php

include 'Message.php';

class MessageFactory {

	static function immediateMessage( $text ) {
		return new Message( $text, false, false );
	}

	static function scheduledMessage( $text, $time ) {
		return new Message( $text, $time, false );
	}

	static function delayedMessage( $text, $duration ) {
		return new Message( $text, false, $duration );
	}
}

$msg1 = MessageFactory::immediateMessage( 'say anything' );
$status = $msg1->send();

$msg2 = MessageFactory::scheduledMessage( 'say anything later', '2012-05-21 22:02:00' );
$status = $msg2->send();

$msg3 = MessageFactory::delayedMessage( 'wait a  bit to say anything', 20 );
$status = $msg3->send();