title: session_set_cookie_params() points to the wrong domain
body: <p>I'm having some pretty weird error when I want to set my session cookie.</p>
  
  <p>If I use the following rule:</p>
  
  <pre><code>session_set_cookie_params(0, '/', $_SERVER['HTTP_HOST'], false, true);
  //$_SERVER['HTTP_HOST'] resolves into "jscripting.nl"
  </code></pre>
  
  <p>It will always put a "." in front of the url and it will always make it so that my session_id will become accessable on all my subdomains, which is a problem since I develop on one of my subdomains and the session_id's might be interfering with each other.</p>
  
  <p>Is there something I'm doing wrong or is something wrong with my server setup?</p>