Wordpress Dropdown Users Filter

add_action('admin_head', 'replace_post_meta_author');

function replace_post_meta_author() {
  $screen = get_current_screen();
  if($screen->id == 'post') {
    add_filter('wp_dropdown_users', 'showme_dropdown_users');
    function showme_dropdown_users( $args = '' ) {
      $post = get_post();
      $selected = $post->post_author;
      $siteusers = get_users('orderby=nicename&order=ASC'); // you can pass filters and option
      $re = '';
      if (count($siteusers) > 0){
          $re = '<select name="post_author_override" id="post_author_override">';
          foreach ($siteusers as $user) {
              $re .= '<option value="' . $user->ID . '">'.$user->user_nicename . ' ('.$user->user_email .')</option>';
          }
          $re .= '</select>';
          $re = str_replace('value="' . $selected . '"','value="' . $selected . '" selected="selected"', $re );
      }
      echo $re;
    }
   }
}