Un codage bien indenté et modulaire.

<?php
session_start();
$_SESSION["index"] = "";
include("includes/connect.php");
include("includes/fonction.php");
$_SESSION["section"] = "programmation";
?>
<?php
include($_SESSION["index"]."includes/header.php");
?>
<div class="css1">
Test de page
</div>
<?php
include($_SESSION["index"]."includes/footer.php");
?>