UserDataProvider::getAdminAvailability

static function getAdminAvailability()
{
	global $USER;

	static $result = null;

	if ($result === null)
	{
		$result = (
			$USER->canDoOperation('edit_all_users')
			&& (
				!ModuleManager::isModuleInstalled('extranet')
				|| Option::get("extranet", "extranet_site", "") === ""
				|| !self::extranetSite()
			)
		);
	}

	return $result;
}