sort posts (sort by views) using post_views_count

i want to sort posts (sort by views) using this function

i am currently using this code in function.php to get post views count

<?php
function getPostViews($postID){
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
        return "0 View";
    }
    return $count.' Views';
}
function setPostViews($postID) {
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        $count = 0;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
    }else{
        $count++;
        update_post_meta($postID, $count_key, $count);
    }
}
?>

i want to integrate post_views_count to sort posts with this code

$params = $_GET;
unset($params['orderby']);
unset($params['order']);
unset($params['v_orderby']);
unset($params['v_sortby']);
$url = $_SERVER["HTTP_HOST"].$_SERVER["REQUEST_URI"];
$url = strtok($url, '?');
$url =$url.'?'.http_build_query($params);

&orderby=comment_count&order=desc
&v_sortby=views&v_orderby=desc

$active = "date";
if ($_GET["orderby"]=="comment_count"){
    $active = "comment";
}
if ($_GET["v_sortby"]=="views"){
    $active = "views";
}