I need to display different pages according to a value that comes from the URI, I made this code, it is not pointing out errors, but it also does not display the contents of h1.
<?php
require_once"cabecalho.php";
$plano = $_GET['plano'];
if($plano == 'parcial'){ ?>
<section class="plano-parcial">
<h1>Plano parcial detalhes</h1>
</section>
<?php } ?>
Put these commands before require_once and see if any errors will appear.
error_reporting(E_ALL);
ini_set('display_errors', 1);
I think your require_once is failing, but you are not set to display errors and / or notices. This is the only possibility of not showing your H1 in your code, other than the obvious (I believe it is not) of not being 'partial' in your GET