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/**

 * This function/shortcode will show all authors on a post

 * 

 * @example <code>[show_authors]</code> is the default usage

 * @example <code>[show_authors]</code>

 */

function show_multiple_authors() {

	$i = new CoAuthorsIterator();

	$return = '';

	$i->iterate();

	$return .= '<a href="'.get_author_posts_url(get_the_author_meta('ID')).'">'.get_the_author_meta('display_name').'</a>';

	while($i->iterate()){

		$return.= $i->is_last() ? ' and ' : ', ';

		$return .= '<a href="'.get_author_posts_url(get_the_author_meta('ID')).'">'.get_the_author_meta('display_name').'</a>';

	}

	return $return;

}

add_shortcode('show_authors', 'show_multiple_authors');