php banner rotation

[leprice]

hello,
how can i do a banner rotation? i've done already this:

<?php

header('Content-Type: image/png');

$image = "bild.png";

readfile($image);

 

[xgtx]

<?php
$banner1 = '1.png';
$banner2 = '2.png';
$banners = array($banner1, $banner2);
shuffle($banners);

header('Content-Type: image/png');
readfile($banners[0]);
?>

Untested.