Website showing AlertView promoting iphone app

[spiderguy84]

I've been to a few different forums and websites on my iPhone (sorry I can't remember which). When you go to the site, it detects you are on an iPhone, and shows what looks just like a UIAlertView stating that there is an iPhone app for this website, and prompts to click OK to redirect. Can someone direct me to how to code my website to do something like this?

[Promo Dispenser]

1. this belongs into a programming subforum.

2. Here is a code you can start with. Add it above the header of your website and design an own iphone optimized website for your content and put it to the path you provided here.
(the path I used is just an example. You can use whatever you want)

PHP Code:

<?php
$browser = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
if ($browser == true)  {
header('Location:http://yourwebsite.com/iphonefriendly/index.php');
}
?>

To see how it works, visit http://iphone.3dmagicbox.com on your PC and on your iphone. You will see the difference (not on ipad!).

[spiderguy84]

Thanks for the suggestion, but what I was looking for wasn't just a way to detect iPhone users and redirect them, but one that shows an alertview telling the user there is an iphone app available on that site.