iframe中的网址随机数

Question

I'm trying to create an iframe which loads a random page from another site. The URL is simply the domain, followed by a number. So far, I have tried PHP:

$number = int rand(0,450000);
$page = 'http://www.example.com/'$number;

Problem is, I don't know how to create the iframe, so that $page goes into the <iframe src=""></iframe>

Perhaps something with javascript? I'm unfamiliar with JS, though. All I know is this from google:

var randomnumber=Math.floor(Math.random()*450001)

But again, I have no idea how to proceed.

Answer 1

<?php
  $rand = rand(0,450000);
  $page = 'http://example.com/' . $rand;
?>
<!-- ... -->
<iframe src="<?php echo $page; ?>"></iframe>
<!-- ... -->

Or, more concisely:

<iframe src="http://example.com/<?= rand(0, 450000); ?>"></iframe>

<?= ... ?> is synonymous with <?php echo ... ?>, btw.