Drupal hook menu user role access argument

user_has_role.module

/**
 * Implements hook_menu().
 */
function user_has_role_menu() {
  $items['admin/mypage'] = array(
    'page callback' => 'user_has_role_page_content',
    'access callback' => '_user_has_role',
    'access arguments' => array(array('editor')),
  );
  return $items;
}

/**
 * @param $roles
 * @return bool
 */
function _user_has_role($roles) {

  if (user_is_logged_in()) {
    global $user;
    if (in_array('administrator', $user->roles)) {
      return TRUE;
    }
    foreach ($roles as $role) {
      if (in_array($role, $user->roles)) {
        return TRUE;
      }
    }
  }
  else {
    return FALSE;
  }
}

/**
 * @return mixed
 */
function user_has_role_page_content() {

  $content['hello'] = array(
    '#prefix' => '<div>',
    '#markup' => t('Looky looky'),
    '#suffix' => '</div>',
  );

  return $content;
}