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Editorial Team
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Asked: 2026-06-18T08:53:50+00:00

My site uses PHP sessions to keep track of a logged in user. Every

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My site uses PHP sessions to keep track of a logged in user. Every page has session_start(); implemented properly, however in chrome when I place www. in from of the domain name it does not use the session variables. When I replace it back without the www. it works fine again, so the variables are not unset but rather just not being used.

In Firefox strangely it is the other way around. www. works and without does not. Is there a way around this? I’m having trouble because I’m using PayPal to redirect to my site and I can’t have my users have to log out and back in directly after.

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  1. Editorial Team

    www.example.com and example.com are NOT the same website. They usually are, but only by convention. www.example.com is a subdomain of example.com

    For this reason, cookies set on example.com will NOT be used on www.example.com and vice versa, because it would be unsafe to assume they are the same thing.

    You can override this behaviour to some extent by allowing the session cookie to work on all subdomains as well as the main domain by setting the php.ini setting session.cookie_domain to .example.com (replace with your own domain name, of course)

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