WpRecipes.com - Daily recipes to cook with WordPress

The first thing to do is to create the function. To do so, paste the following code in your functions.php file:

function getUsersWithRole($role) {
      $wp_user_search = new WP_User_Search($usersearch, $userspage, $role);
      return $wp_user_search->get_results();
}

Once done, you can call the function this way:

$editors = getUsersWithRole('editor');
foreach($editors as $editor){
     //$editor now holds the user ID of an editor
}

Thanks to John Kolbert for this great recipe!