Set cookie on multiple domains with PHP or JavaScript

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Do what Google is doing. Yes, Google is doing this same trick to login the user to YouTube and other Google services which are on different domains.

Create a PHP file that sets the cookie on all 3 domains. Then on the domain where the theme is going to set, create a HTML file that would load the PHP file that sets cookie on the other 2 domains. Example:

<html>
   <head></head>
   <body>
      <p>Please wait.....</p>
      <img src="http://domain2.com/setcookie.php?theme=whateveryourthemehere" />
      <img src="http://domain3.com/setcookie.php?theme=whateveryourthemehere" />
   </body>
</html>

Then add an onload callback on body tag. The document will only load when the images completely load that is when cookies are set on the other 2 domains. Onload Callback :

<head>
   <script>
   function loadComplete(){
      window.location="http://domain1.com";//URL of domain1
   }
   </script>
</head>
<body onload="loadComplete()">

setcookie.php

We set the cookies on the other domains using a PHP file like this :

<?php
if(isset($_GET['theme'])){
   setcookie("theme", $_GET['theme'], time()+3600);
}
?>

Now cookies are set on the three domains.

Source – My Blog

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