function.php

<?php
if (empty($config)) {
    return true;
}

// filter some security here
if(!empty($_GET['lang'])){
    $_GET['lang'] = str_replace(array("'",'"',"&quot;","&#039;"), array('','','',''), xss_esc($_GET['lang']));
}

if (empty($_SESSION['language'])) {
    $_SESSION['language'] = $config->getLanguage();
}
if (!empty($_GET['lang'])) {
    $_GET['lang'] = strip_tags($_GET['lang']);
    $_SESSION['language'] = $_GET['lang'];
}
@include_once "{$global['systemRootPath']}locale/{$_SESSION['language']}.php";

function __($str) {
    global $t;
    if (empty($t[$str])) {
        return $str;
    } else {
        return $t[$str];
    }
}

function getAllFlags() {
    global $global;
    $dir = "{$global['systemRootPath']}view/css/flag-icon-css-master/flags/4x3";
    $flags = array();
    if ($handle = opendir($dir)) {
        while (false !== ($entry = readdir($handle))) {
            if ($entry != "." && $entry != "..") {
                $flags[] = str_replace(".svg", "", $entry);
            }
        }
        closedir($handle);
    }
    sort($flags);
    return $flags;
}

function getEnabledLangs() {
    global $global;
    $dir = "{$global['systemRootPath']}locale";
    $flags = array();
    if (empty($global['dont_show_us_flag'])) {
        $flags[] = 'us';
    }
    if ($handle = opendir($dir)) {
        while (false !== ($entry = readdir($handle))) {
            if ($entry != "." && $entry != ".." && $entry != "index.php" && $entry != "function.php" && $entry != "save.php") {
                $flags[] = str_replace(".php", "", $entry);
            }
        }
        closedir($handle);
    }
    sort($flags);
    return $flags;
}

function textToLink($string) {
    return preg_replace(
        "~[[:alpha:]]+://[^<>[:space:]'\"]+[[:alnum:]/]~", "<a href=\"\\0\">\\0</a>",
        $string
    );
}