Simpan dengan Pesan

form.php
<?php
    if (isset($_GET["msg"])){
        if ($_GET["msg"]=="true"){
            echo "Data Tersimpan nomor: ". $_GET["nomor"];
        }else{
            echo "GAGAL";
        }
    }
?>
<form action="save.php" method="post">
    <input type="text" name="nomor" value="001"/>
    <input type="submit" name="simpan" value="Simpan"/>
</form>

save.php

<?php
$sql = mysql_query("INSERT INTO...");
if($sql){
// jika tersimpan
    header("location:form.php?msg=true&nomor=".$_POST["nomor"]);
}else{
    header("location:form.php?msg=false);
}
?>