Change links on all pages according to PHP - php

Question

Ok my website incorporates different languages, I did:
$lang = isset($_GET['lang']) ? $_GET['lang'] : "";
if (!empty($lang)) {
$curr_lang = $_SESSION['curr_lang'] = $lang;
} else if (isset($_SESSION['curr_lang'])) {
$curr_lang = $_SESSION['curr_lang'];
} else {
$curr_lang = "he";
}
if (!empty($pb20_14users->language == he)) {
echo "&lang=he";
}
if (file_exists("languages/" . $curr_lang . ".php")) {
include "languages/" . $curr_lang . ".php";
} else {
include "languages/he.php";
}
// Returns language key
function lang_key($key)
{
global $arrLang;
$output = "";
if (isset($arrLang[$key])) {
$output = $arrLang[$key];
} else {
$output = str_replace("_", " ", $key);
}
return $output;
}
The text has changed and everything is perfect, but I want to change my URL
&lang=he
But don't go through all the existing pages manually, they were built like this:
<div class="links">
Home<br />
Register<br />
Statistics<br />
Forgot password?
</div>
How do I make all addresses end & lang = he without going through one by one, if it matters I made a table in SQL called language and there is the word he, maybe it will help the thinkers, thank you very much

Answer 1

I recommend you go a (basic) nice url system, your urls will become /en/?page=foo which isnt the biggest rewrite in the url.
RewriteRule ^([a-z]{2})/(.*) /$2&lang=$1 [L]
I havent tested that line, but it should be close. We take everything before the slash (en) and add that to the rest (?page=foo) which results in ?page=foo&lang=en for your script.
Now you can do this and use CURRENT_LANG everywhere in your PHP for the language.
$lang = in_array($_GET['lang'], ['en', 'nl']) ? $_GET['lang'] : 'en';
define('CURRENT_LANG', lang);
Or try to use the <base /> tag in html.