PHP array selected item delete

<?
$tagCollection = array("AJAX", "Analytics", "CSS", "Javascript", "JoshSchumacher.com", "PHP", "Prototype", "Web 2.0");
function strMatch($val)
{
$query = isset($_REQUEST['sel']) ? $_REQUEST['sel'] : '';
return (stripos($val, $query) !== false);
}
$tags = array_filter($tagCollection, "strMatch");
$key = key($tags);
unset($tagCollection[$key]);
print_r($tagCollection);
?>