session.cookie_domain not working on all browsers

Question

The following code sets the session cookie as follow:

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

• FF header - domain=.mysite.com
• IE header - domain=mysite.com (no initial dot)
• Cr header - domain=.mysite.com

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The following code sets the session cookie as follow:

ini_set( 'session.cookie_domain', 'dev.mysite.com' );

• FF - domain=.dev.mysite.com (works)
• IE - domain=mysite.com (ignores subdomain; uses root domain, no initial dot)
• Cr - failed to create session

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Trying to set the Session cookie to a particular subdomain, so that sub1.dev.mysite.com, sub2.dev.mysite.com could access the same Session cookie. But, it only works with FF.

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Set session name to something like SESS_NAME.

Answer 1

Interesting, I found that Chrome does not like underscore. SESS_NAME vs SESSNAME.