Codice PHP:<?php
$valid_pages = array('home', 'alunni', 'attivita', 'volontari', 'contatti');
$default_page = 'home';
$_GET['page'] = isset($_GET['page']) ? $_GET['page'] : '';
$_GET['page'] = in_array($_GET['page'], $valid_pages) ? $_GET['page'] : $default_page;
$file = dirname(__FILE__) . '/' . $_GET['page'] . '.php';
if (is_readable($file)) {
include($file);
} else {
echo('Page not found');
}
?>

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