[PHP] split string value again

[Jacky]

Hi again
have to try again after I have not recieved any advice, I have a vairable that stores 
email address value. I need to break it so that I will only get the dmain name bit to 
store in another variable so that I can redirect user to that domain, like if user 
email is [EMAIL PROTECTED] then I would like to break that and take only foo.com bit to 
use for navigation.
How can I do that?
Jack
[EMAIL PROTECTED]
"There is nothing more rewarding than reaching the goal you set for yourself"