View file vavok-1.5.3/pages/change_lang.php

<?php
/*
* (c) Aleksandar Vranešević
* Author:    Aleksandar Vranešević
* URI:       https://vavok.net
* Updated:   15.07.2020. 1:59:31
*/

require_once"../include/startup.php";

$language = isset($_GET['lang']) ? check($_GET['lang']) : ''; // get language

if (empty($language) && !empty($_POST['lang'])) { $language = check($_POST['lang']); }


// page to load after changing language
$ptl = isset($_GET['ptl']) && !empty($_GET['ptl']) ? urldecode($_GET['ptl']) : ''; 


if (!file_exists("../lang/" . $language . "/index.php")) {
	redirect_to("../index.php?error=no_lang");
} else {
	include '../lang/' . $language . '/index.php';
}

if (!empty($language)) {

	// Set new language
	$users->change_language($language);

}

// ignore language url's, /index.php will do the work
if ($ptl == '/en/' || $ptl == '/sr/' || $ptl == '/fr/' || $ptl == '/de/' || $ptl == '/ru/' || $ptl == '/js/') {
	$ptl = '';
}

if (!empty($ptl)) {
	redirect_to($ptl);
} else {
	redirect_to("../");
}
?>