Help me with this PHP code

Website video script.....

here's the function

function get_list_by_tag($tag,$page,$per_page,$sort){
	$orderby=$sort;
	$tag=str_replace(" ","+",$tag);if($page>3){$page=1;}
	$xml_data = file_get_contents("http://gdata.youtube.com/feeds/api/videos?vq=$tag&start-index=".(($page-1)*10+1)."&max-results=$per_page&orderby=$sort");
	$xml_data=str_replace("<title type='text'>","<title>",$xml_data);
	$xml_data=str_replace("<content type='text'>","<content>",$xml_data);
	$xmlObj = new XMLParser($xml_data);
	$arrayData = $xmlObj->createArray();

Code (markup):

if((empty($_GET['video']) or $_GET['video']=="") and empty($_GET['tag'])){
	echo prepare_and_show("",get_list_by_tag($tag_by_default,1,10,"relevance"));
}

Code (markup):

$tag_by_default refers to config.php where the KEYWORD (for the videos) tags are.

As of now, the tags are showing along with the videos. I want the tags removed, but cant figure out what/how to take em out.

$page,$per_page,$sort are ok, juts dont want $tags DISPLAYED

Any help appreciated!