PHP Session Cookies Across Subdomains and Multiple Domains

I was looking into how to make sessions work across multiple subdomains and found this post to be most helpful.

PHP Session Cookie Multiple Domains

My Fix

So you need to change the php session configuration option for session.cookie_domain from the default of “” (which inserts your hostname) to:

“.domain.com”

You can do this with: session_set_cookie_params() before doing your session_start() or if you have php start your sessions for you automatically you might consider throwing:

php_value session.cookie_domain ".domain.com"into the .htaccess file for the site. If you put the .htaccess file in the directory for xxx.domain.com then all sessions started on xxx.domain.com will be shared on all other domains like www.domain.com. This means however that sessions started in www.domain.com won’t carry over unless the .htaccess file is also present in it’s root directory.

Important Note

The first dot in “.domain.com” is not always nessesary however for support of all browsers it is suggested.

Technorati Tags: .htaccess, php, sessions, cookies, subdomains

Comments

[Federico]

This was the work of a genius!
Thank you very much!

[Mauricio]

Your suggest work with FF but Not worked with IE, maybe you have a solution for IE.

[kiran]

Very helpful. thanx...........

[Prmaod]

Hi,

This is what i was looking for sharing the same session for my 96 subdomains. fantastic article. Keep it up

[Neeraj]

Thanks

[seo free]

Thanks lot..helped me lot...

[Endi]

Thanks. Very helpful article!

[seo]

Great fix but as already posted does not work in IE. Does anybody have any suggestions?

[Anders]

Thank you so much.

This really helped me out :)

[siva]

Thanks.......

[Norris Ewelike]

I'm amazed that a comment from 2006 is still relevant. what else in IT is the same for 4 years? :)