<?php
$settings = array(
	'classes'     => array('home'),
	'title'       => 'Titel',
	'description' => 'Beschreibung',
);
include('inc/header.inc.php');
?>

<h1>Startseite</h1>
<p>Inhalt</p>

<?php include('inc/footer.inc.php'); ?>

<?php
$settings = array(
	'classes'     => array('home'),
	'title'       => 'Titel',
	'description' => 'Beschreibung',
);
include_once('inc/header.inc.php');
?>

<h1>Startseite</h1>
<p>Inhalt</p>

<?php include_once('inc/footer.inc.php'); ?>

Use include_once() instead of include().
Use include_once() instead of include().
