<head>
...
<?php
$url = array("http://wwww.test.com/a",
"http://wwww.test.com/b",
"http://wwww.test.com/c",
"http://wwww.test.com/d");
$rand = array_rand($url, 1);
?>
<meta http-equiv="refresh" content="20;URL=<?php echo $url[$rand];?>">
...
</head>
Sayfanın kendi kendini yenilemesi için:
<head>
...
<meta http-equiv="refresh" content="60">