Description:
------------
When you enable the strict mode and then you execute session_start() without supplying a PHPSESSID (using php-cgi, cli, or ApacheBench for example), PHP creates two session ids and returns two SetCookie headers with both session ids.

I believe the second session id can be avoided since PHP knows it just created the session id for the first time.

Test script:
---------------
<?php
ini_set("session.use_strict_mode", "1");
ini_set("session.save_handler", "files");
session_start();
?>


Expected result:
----------------
"
Set-Cookie: PHPSESSID=k6brqpp9rnh2ajo2tch4l68t84; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-type: text/html
"


Actual result:
--------------
"
Set-Cookie: PHPSESSID=k1hn6r22om8kiq60nq72hhsa52; path=/
Set-Cookie: PHPSESSID=k6brqpp9rnh2ajo2tch4l68t84; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-type: text/html
"