Rebuild Querystring

//
// Example: echo '<a href="?page='. $previousPage . rebuildQueryString("page,submit") .'">Prev</a>';
// This would carry over any querystrings from the current URL, minus the current
// $_GET['page'] and $_GET['submit'] keys and values if they exist
//
function rebuildQueryString($curr_vars='')
{
    if(!empty($_SERVER['QUERY_STRING']))
    {
        $parts = explode("&", $_SERVER['QUERY_STRING']);
        $curr_vars = str_replace(" ", "", $curr_vars);
        $c_vars = explode(",", $curr_vars);
        $newParts = array();
 
        foreach ($parts as $val)
        {
            $val_parts = explode("=", $val);
            if(!in_array($val_parts[0], $c_vars))
            {
            	array_push($newParts, $val);
            }
        }
 
        if(count($newParts) != 0)
        {
            $qs = "&".implode("&", $newParts);
        }
        else
        {
            return false;
        }
        return $qs;
    }
    else
    {
        return false;
    }
}