'administrator', 'orderby' => 'display_name', 'fields' => array('ID','display_name'));
$admins = get_users($args);
$args = array('role' => 'editor', 'orderby' => 'display_name', 'fields' => array('ID','display_name'));
$editors = get_users($args);
$args = array('role' => 'author', 'orderby' => 'display_name', 'fields' => array('ID','display_name'));
$authors = get_users($args);
$args = array('role' => 'contributor', 'orderby' => 'display_name', 'fields' => array('ID','display_name'));
$contributors = get_users($args);
foreach ($admins as $user) {
$arr[]=array($user->ID,$user->display_name,'