Embed Customisation Supporting “Co-Authors Plus”

So i went in to do some volunteer work today planning to implement the changes to the website outlined in Embedded Post Customisation only to realise that their site uses “Co-Authors Plus” (meaning posts and pages can have multiple authors).

Thus I fiddled around until I figured out how to get each co-author and display them all, with my first attempt simply outputting them all in a single line as shown here:

/**
 * Removes the title (David Stockdale).
 */
add_filter('embed_site_title_html','__return_false');
/**
 * Adds the author's names (David Stockdale).
 */
add_action( 'embed_content', 'embed_author' );
/**
 * Adds the author div to the embed iframe (David Stockdale).
 */
function embed_author() {
    $output = '<div class="wp-embed-author">';
	$coauthors = get_coauthors();
	foreach( $coauthors as $coauthor ): 
		$output .=  ' ';
    	$output .=  $coauthor->user_firstname;
		$output .= " ";
		$output .=  $coauthor->user_lastname;
		$output .= " ";
    	$output .= get_avatar( get_userdata( $coauthor->ID ), 20 );
	endforeach;
	$output .= '</div>';
    echo $output;
}

My second attempt was slighly more elegant as it outputted the authors as a list.

/**
 * Removes the title (David Stockdale).
 */
add_filter('embed_site_title_html','__return_false');
/**
 * Adds the author's names (David Stockdale).
 */
add_action( 'embed_content', 'embed_author' );
/**
 * Adds the author div to the embed iframe (David Stockdale).
 */
function embed_author() {
    $output = '<div class="wp-embed-author"><ul>';
	$coauthors = get_coauthors();
	foreach( $coauthors as $coauthor ): 
		$output .=  '<li>';
    	$output .=  $coauthor->user_firstname;
		$output .= " ";
		$output .=  $coauthor->user_lastname;
		$output .= " ";
    	$output .= get_avatar( get_userdata( $coauthor->ID ), 20 );
		$output .= '</li>';
	endforeach;
	$output .= '</ul></div>';
    echo $output;
}

However this had it’s own problems as a small enough image combined with a long enough list could look rather messy….

Perhapse I can place the list within columns? For now i’ll submit the second version and see what the boss thinks.