How to add a third language in PHP?

How to add a third language with this specific code format? I have successfully managed 2 languages. I would like to add more than 3 languages. Thank you in advance.

<?php 
    session_start();
    
    if (!isset($_SESSION['lang']))
        $_SESSION['lang'] = "en";
    else if (!isset($_GET['lang']) && $_SESSION['lang'] != $_GET['lang'] && !empty($_GET['lang'])) {
         if ($_GET['lang'] == "en")
             $_SESSION['lang'] = "en";
         else if ($_GET['lang'] == "sp")
             $_SESSION['lang'] = "sp";}

source https://stackoverflow.com/questions/70146241/how-to-add-a-third-language-in-php

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