title: PHP read a cookie that is on another domain
body: <p>I have two domains. One domain contains the login script. It creates a cookie when logged in. Another domain have a URL shortener.</p>
  
  <p>So, on the 2nd domain that have the URL Shortener script have a file called session.php. Usually I was using <code>$_COOKIE['sessionid']</code> to get the session id and match it using database.</p>
  
  <p>How can I get the session id now? I have tried few ways but none of them have solve my problem.</p>