Changing the path in a URL for a multilingual website - php

Question

I am coming to you to find out if it is possible to change the path in a URL using a PHP variable.
My goal would be to organize my website with 2 folders (one for each language), choose the language on a random page in one of the two folders and be able to change the language by modifying the URL.
For example, I'm on http://truc.com/fr/test.php; I change the language and I get http://truc.com/en/test.php.
I've done a test that works but I'd prefer something more dynamic, that will work on all the pages of the website:
fichier index.php
<?php
session_start();
if (!isset($_SESSION['lang']))
if (!isset($_SESSION['lang']))
$_SESSION['lang'] = "fr";
else if (isset($_GET['lang']) && $_SESSION['lang'] != $_GET['lang'] && !empty($_GET['lang']))
{
if ($_GET['lang'] == "fr")
$_SESSION['lang'] = "fr";
else if ($_GET['lang'] == "en")
$_SESSION['lang'] = "en";
}
if($_SESSION['lang']==fr)
{
header('Location: http://localhost/site/languages/fr/index.php');
}
else if($_SESSION['lang']==en)
{
header('Location: http://localhost/site/languages/en/index.php');
}
?>

Answer 1

Adjusted your code and added a new variable $page_language that handles the page language and redirects to specific link for various languages and before redirecting to the page a session language is set to remember it on next page . Good luck
if (isset($_SESSION['lang'])) {
$page_language = $_SESSION['lang'];
} elseif (isset($_GET['lang']) && !empty($_GET['lang'])) {
$page_language = $_GET['lang'] ;
} else {
$page_language = "fr" ; //set default language if no session and url has language
}
if ($page_language == "fr") {
$_SESSION['lang'] = "fr"; //set session language for later visits
header('Location: http://localhost/site/languages/fr/index.php');
exit;
} elseif ($page_language == "en") {
$_SESSION['lang'] = "en"; //set session language for later visits
header('Location: http://localhost/site/languages/fr/index.php');
exit;
}