Simple Last.fm now playing

now-playing.php

<?php
	class NowPlaying{
		private $url;
		private $noTrackPlayingMessage;

		function __construct($user, $api_key){
			$this->url  = 'http://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&limit=1';
			$this->url .= '&user=' . $user . '&api_key=' . $api_key;
			$this->noTrackPlayingMessage = 'nothing is playing right now!';
		}

		public function getNowPlaying(){
			$xml = simplexml_load_file($this->url);
			$track = $xml->recenttracks->track;
			$nowplaying = $track->attributes()->nowplaying;

			if($nowplaying){
				$artist = $track->artist;
				$songname = $track->name;

				if($track->image->attributes()->size == "medium"){
					$image = $track->image;
					return $artist . " - " . $songname . "<br /><img src=".$image;
				} else {
					return $artist . " - " . $songname;
				}
			}
			else{
				return $this->noTrackPlayingMessage;
			}
		}

		public function setNoTrackPlayingMessage($messageIn){
			$this->noTrackPlayingMessage = $messageIn;
		}
	}

	$now_playing = new NowPlaying('_USERNAME_', '_API-KEY_');
	$now_playing->setNoTrackPlayingMessage('not listening to anything right now');
	echo $now_playing->getNowPlaying();
?>