Php Sessions and cookie problems

Hey guys, I am putting up a test site for another one of my sites that is written completely in php. My problem is, my login fields are coming out blank after I try to login.

I only have an IP address for my new host (my testing environment) and the other site is on a domain name. Now this site works fine, but on the new one (where I only have an ip address) it does not.

Here is my set cookie code with an ip address instead of a domain.

setcookie ("username", $check, time() + 2419200, "/", "64.8.116.246");

Is there another way to use an IP address. The site that is working is like this;

setcookie ("username", $check[email], time() + 2419200, "/", ".domainname");

I am really trying to figure this problem out, it is wasting a lot of my time.

 

Why do you necessarily need to specify the domain?

 

You realize, in some cases, two domains can have the same IP?

This is not the way to code cookies maybe?

http://us3.php.net/manual/en/function.setcookie.php

 

Thank you all for your help, but I am aware of setting up with a domain and I am aware of shared IP's. I have a dedicated IP and I MUST use the IP. This is my test site. I do not have a domain name pointed to it.

So please help me to figure it out using an ip of we can. My IP and not their Ip.

Thanks

setcookie ("username", $check, time() + 2419200, "/", "64.8.116.246");

 

Well, I am repeating my question.

Why do you necessarily need to specify the domain?

Why wouldnt

setcookie ('username', $check['email'], time() + 2419200);

PHP:

work?

 

setcookie ("username", $check, time() + 2419200, "/");