/**
     * Function to search users
     * @param $phrase
     * @return string
     */
    public function searchUsers($phrase){
        $parameters = new ListUsers();
        $parameters->filter = "*" . $phrase . "*";
        $parameters->maxItemLimit = -1;

        return $this->serviceStub->listUsers($parameters)->return;
    }
 /**
  * Function to get a list of users
  * 
  * @return username list
  */
 public function listUsers()
 {
     $parameters = new ListUsers();
     $parameters->filter = "*";
     $parameters->filter = -1;
     return $this->serviceStub->listUsers($parameters);
 }