Hi ....
I create two application, let say my first application called mastersite, and the second application called childesite. I store the childesite project under the mastersite project directory.

I create virtual host in my apache server, and the document root of the directory point to masterproject directory supposed the virtual host name is www.mastersite.com. after that i create sub domain of virtual host supposed the subdomain of virtual host name is, www.childesite.mastersite.com.

while www.mastersite.com is opened by a browser, the application stored the dummy data to its session. Supposed I name it to dummy_data, and the dummy_data set to '123'. dummy_data = '123';

while www.childesite.mastersite.com is opened, it will read the dummy_data from the mastersite.com domain and print out the dummy_data to the browser. but The www.childesite.mastersite.com is blank, because it can't read the domain session.

but, if i try open the childesite using www.mastersite.com/childesite the dummy data will be printed out to the browser.

why these thing could by happened ?

Before session_start you have to set session params:

session_set_cookie_params(0,'/','mastersite.com');

BUT this must be set when the browser points to mastersite.com AND NOT www.mastersite.com

I've tried to set session_set_cookie_params(0,'/','mastersite.com'); before session start in the childesite file. but The program still can't read the domain session.

Could you give me more detail explanation about this ?

put ini_set("session.cookie_domain",".mastersite.biz") ; in the domain and subdomain program before session started

Hi ...., I've deployed simple machine forum at smf.com domain, and than I created simple application to read session from the smf.com, but i deployed the simple application in the subdoamin, let say I put my simple application in simple.smf.com
In order to read session from domain, I must put ini_set("session.cookie_domain",".smf.com"); before session start. I must put it in the smf project file and also simple aplication too.
where I should put ini_set("session.cookie_domain",".smf.com") so it will by pass to the session start.
I have put the ini_set("session.cookie_domain",".smf.com") in the load.php file

PHP Code:

function loadSession()
{
   global $HTTP_SESSION_VARS, $modSettings, $boardurl, $sc;

   // Attempt to change a few PHP settings.
   @ini_set("session.cookie_domain",".smf.com");
   @ini_set('session.use_cookies', true);
   @ini_set('session.use_only_cookies', false);
   @ini_set('url_rewriter.tags', '');
   @ini_set('session.use_trans_sid', false);
   @ini_set('arg_separator.output', '&');
} 


while I try to read cookie form subdomain. It couldn't read the domain session. my subdomain code is:

PHP Code:

<?php 
 ini_set("session.cookie_domain",".smf.com");
 session_start();

 print_r($_SESSION);
?>