Display Popular Tags Cloud

<?php
function display_popular_tags_cloud() {
    $args = array(
        'smallest' => 8,
        'largest'  => 22,
        'unit'     => 'px',
        'number'   => 20,
        'orderby'  => 'count',
        'order'    => 'DESC',
    );
    echo '<div class="popular-tags-cloud">';
    wp_tag_cloud($args);
    echo '</div>';
}
add_action('wp_footer', 'display_popular_tags_cloud');