WordPress – How to make media library only show current users images

The following WordPress function will make the media library only show the current users images, with the exception of Administrators, which can see all images.

add_filter( 'ajax_query_attachments_args', 'show_current_user_attachments' );
function show_current_user_attachments( $query ) {
     $user_id = get_current_user_id(); // get current user ID
     if ( $user_id && !current_user_can('manage_options')) {  // if we have a current user ID (they're logged in) and the current user is not an administrator
         $query['author'] = $user_id; // add author filter, ensures only the current users images are displayed
     }
     return $query;
 }