Setcookie Different for Different URLs

Hi I have a problem with set cookie. I have a url like this

http://www.myweb.com/series/Setayesh/Part-1

At this url I check if the cookie is set or not by this

if(isset($_COOKIE['cookiename']))
{
 //Perform some operations
}
else
{
setcookie('cookiename',$value,time()+36000)
}

It works well for all urls like

http://www.myweb.com/series/Setayesh/P开发者_如何学Cart-1
http://www.myweb.com/series/Setayesh/Part-1
http://www.myweb.com/series/Setayesh/Part-1
and so on

But when url becomes

http://www.myweb.com/series/Pezeshkan/Part-1

The if condition doesn't executes it always come in else condition in same browser. What is this problem? When I am setting cookie I am not setting any url then why it behaves different for such condition.

---

The problem is, that the cookie is set to the path that you are requesting. In your case you are issuing the cookie for the path

/series/Setayesh/Part-1

So if that path changes to

/series/Pezeshkan/Part-1

you cannot see the cookie anymore as it was issued for another path. The setcookie function has a fourth parameter "path" which allows to specify the path explicitely. If you set it to "/" the cookie will be valid for the whole domain:

setcookie('cookiename',$value,time()+36000, '/')

This should solve the issue.