* @return array Array with two items: (html, classes)
* - html: String: HTML for displaying the tags (empty string when param $tags is empty)
* - classes: Array of strings: CSS classes used in the generated html, one class for each tag
*/
* @return array Array with two items: (html, classes)
* - html: String: HTML for displaying the tags (empty string when param $tags is empty)
* - classes: Array of strings: CSS classes used in the generated html, one class for each tag
*/