Need Help With The Easiest Logic

ok so i need help in sorting out the easiest way to do this

i have 4 diffrent servers from where i can pull data what i want to do is

In the first visit it pulls data from server 1 then from the second visit it pulls data from server 2 then from server 3 and then from server 4 and 4 is used again back to 1

right now i am doing this using php random but it wont equally distribute it this way

can u tell me how to do this the easiest way ?

 

Use a cookie. Then have the script check for the cookie, increment by 1, and reset the cookie each time. This way you are pulling data from servers and it will survive the user leaving and coming back.

You could also use a session variable if you would prefer not to set a cookie, but it will reset if the browser is closed or the session times out.