phorge-phorge/src/applications/people/controller/PhabricatorPeopleController.php

<?php

abstract class PhabricatorPeopleController extends PhabricatorController {

  public function buildSideNavView() {
    $nav = new AphrontSideNavFilterView();
    $nav->setBaseURI(new PhutilURI($this->getApplicationURI()));

    $is_admin = $this->getRequest()->getUser()->getIsAdmin();

    if ($is_admin) {
      $nav->addLabel(pht('User Administration'));
      $nav->addFilter('edit', pht('Create New User'));
      if (PhabricatorEnv::getEnvConfig('ldap.auth-enabled') === true) {
        $nav->addFilter('ldap', pht('Import from LDAP'));
      }
    }

    $nav->addFilter('people',
      pht('User Directory'),
      $this->getApplicationURI());

    if ($is_admin) {
      $nav->addFilter('logs', pht('Activity Logs'));
    }

    return $nav;
  }

  public function buildApplicationMenu() {
    return $this->buildSideNavView()->getMenu();
  }

  public function buildApplicationCrumbs() {
    $crumbs = parent::buildApplicationCrumbs();
    // I'm sure this copypasty is wrong.
    $is_admin = $this->getRequest()->getUser()->getIsAdmin();

    if ($is_admin) {
      $crumbs->addAction(
        id(new PhabricatorMenuItemView())
          ->setName(pht('Create New User'))
          ->setHref($this->getApplicationURI('edit'))
          ->setIcon('create'));
    }

    return $crumbs;
  }

}