<?php

$http_host = $_SERVER['HTTP_HOST'] ?? '';
$request_uri = $_SERVER['REQUEST_URI'] ?? '';

$default_url = strpos($http_host, 'en.zstack') || strpos($request_uri,'/en/') ? "/help/en/":"/help/"; 

$file = exec('find -name index.html |sort -r | head -1');
if (!file_exists($file))
	$file = exec('find -name 1.1.html |sort -r | head -1');
if (!file_exists($file))
	$file = exec('find -name 1.html |sort -r | head -1');

if (file_exists($file))
	header("Location:$file");
else 
	header("Location:$default_url");
?>