<?php
header("Cache-Control: no-store, no-cache, must-revalidate");  // HTTP/1.1
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");  

session_start();
if(isset($_POST['new'])) session_destroy();
if(!isset($_SESSION['flag'])) $_SESSION['flag'] = 0;



if(isset($_POST['ok'])){
switch($_SESSION['flag']){
	case 0:
		echo "0  seite";
	break;
	case 1:
		echo "1  seite";
	break;
	case 2:
		echo "2  seite";
	break;
	case 3:
		echo "3  seite";
	break;
	case 4:
		echo "4  seite";
	break;
}
$_SESSION['flag'] +=1;
}
?>
<form method=post>
	<input type=submit name=ok value=akzeptieren>
</form>
<form method=post>
	<input type=submit name=new value="von vorne anfangen">
</form>