Twitter - Print latest tweet from user (extracts from RSS feed in PHP and linkifies links)

function parse_feed($feed) {
		preg_match_all(
			'/<description>(.*?)<\/description>/s',
			$feed,
			$tweets,
			PREG_SET_ORDER
		);
  		$tweet = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]","<a href=\"\\0\">\\0</a>", $tweets[1][1]);
		return $tweet;  
	}  
 
	$feed = "http://twitter.com/statuses/user_timeline/26248137.rss";
	$twitterFeed = file_get_contents($feed);  
	echo parse_feed($twitterFeed);
 
 
// Without the function and storing it in a user's cookie that is checked every 30min
	$feed = file_get_contents("http://twitter.com/statuses/user_timeline/26248137.rss");
	preg_match_all(
		'/<description>(.*?)<\/description>/s',
		$feed,
		$tweets,
		PREG_SET_ORDER
	);
  	$tweet = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]","<a href=\"\\0\">\\0</a>", $tweets[1][1]);
 
	if (!$_COOKIE['lasttweet']) {
		setcookie("lasttweet", $tweet, time()+1800);  /* expire in 30min */
		echo $tweet;
	}else{
		echo $_COOKIE['lasttweet'];
	}