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I have a user_reference field in a content type. I want to remove all the users from it except from current user and administrators. Only administrator should see the complete users list.

I started by checking id=f current user is ad administrator.

function usersfilter_form_alter(&$form, &$form_state, $form_id) {
     global $user;
     if (in_array('administrator', array_values($user)){
        return; //administrator
     }

Now I prepare the array that will be the new users list (can I just remove oart of the users instead?) and get the users list:

    $newUsers = array();
    $existingUsers = $form['field_users']['und']['#options'];

Finally I go over all the users. If this is the current user name, I'll add it. How can I check if this user is an administrator?

foreach ($existingUsers as &$existingUser) {
  if ($existingUser = $user->name) {
    $newUsers[] = $existingUser;
    break;
  }

  // If administrator, add to the list.
}
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  • As side note, there is a typo in your last snippet: You are using $existingUser = $user->name in the control statement when you should use $existingUser == $user->name.
    – apaderno
    May 23 '12 at 9:27
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In Drupal you should use the user_access() function with a specific permission to find out if the user has a certain level of access, not check their roles directly. The result is the same but it's just considered better practice to use the in-built permissions system.

You can use the user_load_by_name() function to load the user if you don't have the account id/user object already, e.g.:

$account = user_load_by_name($user_name);
if (user_access('access administration pages', $account)) {
  // Do something
}
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  • thank you. that works. Just for documentation, here is the complete code pastebin.com/JH8x9RHz
    – Tibo
    May 23 '12 at 9:07
  • @Tibo The reason user_access() should be used is that a permission could be added to more than one role. using user_access(), the code doesn't change (the permission is still the same, e.g. "administer nodes"); using in_array('administrator', $roles), the code could need to be changed, as you could need to check if the user don't have other roles too.
    – apaderno
    May 23 '12 at 9:31
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You can check what roles the user have with code similar to the following one:

global $user;

if (in_array('administrator', $user->roles)) {
  // The user is an administrator.
}
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  • the variable $existingUser is just the user name. not the complete user object, right? so it has no property named "roles".
    – Tibo
    May 23 '12 at 8:56
  • you get the current user always by using global $user; that object will get you the roles property. edited my answer to reflect that.
    – cmos
    May 23 '12 at 8:59

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