increment ID in a page on reload

[jasondavis]

I have a page that has an iframe on it,

<iframe src="index.php?u=<?=$ID?>" width="400"></iframe>

What I need to do is on every page reload increment the $ID variable so I load the page 1 time then
$ID = 1

new page reload

$ID = 2

how can I do this?

[jasondavis]

should add i would liek to do without a database

[jasondavis]

Ok here is what I came up with, it works, is there an easy way to set the initial session ID number

<?PHP
session_start();
//$_SESSION['ID2'] = 146;
$x = $_SESSION['ID2'];
$x++;
$_SESSION['ID2'] = $x;

$ID = $_SESSION['ID2'];
echo $ID;


$output .= "<iframe src=\"iframe.php?u=$ID\" width=\"400\"></iframe>";
echo $output;
?>

[rowanparker]

Yes, using sessions is probably the best way.