if($result) {
echo '<script type="text/javascript">
window.location.href = "index.php";
</script>';
include ("alert.php");
$showFormular = false;
} else {
echo 'Beim Abspeichern ist leider ein Fehler aufgetreten<br>';
}
}
}

<script src = "https://cdn.jsdelivr.net/sweetalert2/6.6.2  /sweetalert2.min.js"> </script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/sweetalert2/6.6.2/sweetalert2.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.4.1/core.js"> </script>


<script>
window.onload = function ()
{
swal({
title:"Erfolgreich",
type:"success",
background:"#f2f2f2",
confirmButtonColor:"#0080ff"
})
}
 </script>