problem with cookie

[newman 0]

hi all . i've got a problem with cookies .
when i add www in my URL the cookies do not work .
1 ) http://mydomain.com ( cookies work )
2 ) http://www.mydomain.com ( cookies do not work )
have anyone had this problem ?
thanks in advance .

[newman 0]

can anyone help ?

[ToonMariner 0]

hwat parameters are you passing to the setcookie function?

[arianhojat 0]

http://www.php.net/manual/en/function.setcookie.php

domain argument for setcookie: "To make the cookie available on all subdomains of example.com then you'd set it to '.example.com'. The . is not required but makes it compatible with more browsers. Setting it to www.example.com  will make the cookie only available in the www  subdomain"

so to make it work for everything, maybe try ".mydomain.com" as the domain argument in setcookie()