The problem with array_map is that the callback function does not accept the key as an argument. You could write your own function to fill the gap here:
function array_map_assoc( $callback , $array ){
$r = array();
foreach ($array as $key=>$value)
$r[$key] = $callback($key,$value);
return $r;
}
Now you can do that:
echo implode(',',array_map_assoc(function($k,$v){return "$k ($v)";},$array));
