Get latest tweet from Twitter API, insert anchor tags and return the string.

Latest_tweet.php

$url = "https://api.twitter.com/1/statuses/user_timeline/$userid.xml?count=1&include_rts=1callback=?";
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

$xml = simplexml_load_file($url) or die("could not connect");
foreach($xml->status as $status){
	$tweet = $status->text;
}

if(preg_match($reg_exUrl, $tweet, $url)) {
	return preg_replace($reg_exUrl, "<a href=\"{$url[0]}\">{$url[0]}</a>", $string);
} else {
	return $tweet;
}