HowTo: Get Cookies Across Subdomains PHP

Meta: VoiDeT April 08th 2008 // PHP // 4,563 views

So you are using cookies on your website, but when a visitor visits www.yourdomain.com and yourdomain.com the cookie doesn’t get set across both! That is because in essence, www. is simply a subdomain. The “www” component is not a protocol, it is not necessary, instead all it is, is just a marketing ploy. But anyway. Here is what you would do normally:

setcookie('YourCookieName', 'Some Values', time() + 3600, '/', 'mydomain.com');

Damn! Almost there! The part you are missing to add a cookie irrespective of the subdomain is “.mydomain.com”. Yep, just add a . infront of your domain name. So you would have:

setcookie('YourCookieName', 'Some Values', time() + 3600, '/', '.mydomain.com');

All done ^^ Enjoy

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Comments About HowTo: Get Cookies Across Subdomains PHP

// 6 comments so far.

Aaron // June 25th 2008

Thanks!
Kenneth // October 31st 2008

Nice tutorial
Biily Bob // April 23rd 2009

Great tut, straight to the point. Good work.
SpYeR // October 29th 2009

Thanks. Very useful for sites with blogs.mydomain.com, news.mydomain.com etc.
khal3d // December 12th 2009

what about session?
VoiDeT // December 12th 2009

ini_set(’session.cookie_domain’, ‘.whatever.com’); should do the trick