[Plugin: Magic Fields] Duplicate field output separated by commas and ampersand

Just FYI that I do know how to do this using an unordered list; however, there is one place in my template where that simply won’t work. So if there is a way to do this without wrapping it in <li> tags, I will be very happy.

Hi, check this example

$all_elements = array('one','two','cat','dog','mon');

$all_names = "";

if (count($all_elements) > 2) {
	$new = array_slice($all_elements,count($all_elements)-1,count($all_elements));
	$new[] = implode(" , ",array_slice($all_elements,0,count($all_elements)-1));
	$all_names =implode(' & ',array_reverse($new));
}else{
	$all_names = implode(" & ", $all_elements);
}
echo $all_names;

Any idea how to grab the output of my foreach statement and put it into an array to use in your example? My code is looking more like this:

if(!function_exists('contributor')){
	function contributor(){
		global $post;
		$Contributors = get_group('Contributor');
		foreach($Contributors as $Contributor){
			if( in_array('Artist',array_values($Contributor['contributor_role']) ) ) {
				echo '<a href="'.$Contributor['contributor_link'][1].'">'.$Contributor['contributor_name'][1].'</a>';
			}
		}
	}
}

I know how to modify hunk’s code to list the contents of contributor_name, regardless of the associated contributor_role, but I can’t figure out how to limit the output to only the names with the role ‘Artist’ or how to wrap the output in the link code. I’m still learning how to modify php, so could someone please break this down for me?

For the record, this modification didn’t work:
$all_elements = array(contributor());

That would have been too easy, wouldn’t it? It displayed the output of my function, but not with commas or the amperstand.