Allow php sessions to carry over to subdomains

Here are 4 options.

Place this in your php.ini:

session.cookie_domain = ".example.com"

Or in your .htaccess:

php_value session.cookie_domain .example.com

Or as the first thing in your script:

ini_set('session.cookie_domain', '.example.com' );

Or in your php-fpm pool configuration for your site:

php_value[session.cookie_domain] = .example.com

        if(isset($_COOKIE['session_id']))            session_id($_COOKIE['session_id']);        Zend_Session::start(); //or session_start();        if(!isset($_COOKIE['session_id']))            setcookie('session_id', session_id(), 0, '/', '.yourdomain.com');

security be damned, if you are as frustrated with incomplete or bad answers as I am, this is your savior. It just works.

change the session name at the top of the core functions filelike

 session_name('mysession');

then use the following code into the php page

  session_set_cookie_params(0,"/",".example.com",FALSE,FALSE);  setcookie(session_name(), session_id(),0,"/","example.com");  session_start();

finally change the default session name of the subdomain and remove the default cookie in subdomain's core functions filelike:

 /*default session name*/ session_name("mysession"); /*remove the PHPSESSID and default session name from subdomain's cookie*/ setcookie( "mysession", "",1,"/" ); setcookie( "PHPSESSID", "",1,"/" );

if you continue with using your cookie name as PHPSESSID ,just remove all the functions with

 "mysession" string like session_name('mysession'), setcookie( "mysession", "",1,"/" );

then check your browser's existing cookies, just remove all the cookies of domain and subdomain, and repeat the process.