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   2. drupal7

Callback function for admin mass adding/deleting a user role.

Code

modules/user/user.module, line 1879

<?php
function user_multiple_role_edit($accounts, $operation, $rid) {
  // The role name is not necessary as user_save() will reload the user
  // object, but some modules' hook_user() may look at this first.
  $role_name = db_result(db_query('SELECT name FROM {role} WHERE rid = %d', $rid));

  switch ($operation) {
    case 'add_role':
      foreach ($accounts as $uid) {
        $account = user_load(array('uid' => (int) $uid));
        // Skip adding the role to the user if they already have it.
        if ($account !== FALSE && !isset($account->roles[$rid])) {
          $roles = $account->roles + array($rid => $role_name);
          user_save($account, array('roles' => $roles));
        }
      }
      break;
    case 'remove_role':
      foreach ($accounts as $uid) {
        $account = user_load(array('uid' => (int) $uid));
        // Skip removing the role from the user if they already don't have it.
        if ($account !== FALSE && isset($account->roles[$rid])) {
          $roles = array_diff($account->roles, array($rid => $role_name));
          user_save($account, array('roles' => $roles));
        }
      }
      break;
  }
}
?>