Can I use mod_rewrite with switch case - php

Question

My website has 2 languages. When I change language, I want the URL to change as well, similar to this:
www.domain.com
changing to this:
www.domain.com/th
and this:
www.domain.com/en
My php:
config.php
<?php
session_start();
error_reporting(E_ALL ^ E_NOTICE);
ini_set('display_errors', 1);
if(empty($_SESSION['language'])){
$_SESSION['language'] = "th";
}
if ($_SESSION['language'] == "th") {
include $_SERVER['DOCUMENT_ROOT'] . "/language/th.php";
} else {
include $_SERVER['DOCUMENT_ROOT'] . "/language/en.php";
}
$base_url = "/";
function lang($th, $en) {
if ($_SESSION['language'] == "th") {
return $th;
} else {
return $en;
}
}
lang.php
<?php
session_start();
switch ($_POST["lang"]) {
case "th":
$_SESSION['language'] = "th";
echo json_encode("complete");
break;
case "en":
$_SESSION['language'] = "en";
echo json_encode("complete");
break;
default :
break;
}
?>
links to change language
<li><a href="javascript:lang('th');" <?= $_SESSION['language'] == "th" ? 'class="active"' : ''; ?> >TH</a></li>
<li><a href="javascript:lang('en');" <?= $_SESSION['language'] == "en" ? 'class="active"' : ''; ?> >EN</a></li>
Can I use .htaccess to do this?

Answer 1

No, you can't acceess the PHP session from .htaccess. But you could use mod_rewrite to rewrite every request to your config.php.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
# Only for non-existing directories, files or symlinks
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule .* config.php [L]
</IfModule>