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 ?

In the absence of any knowledge of servers or network, just do it cyclically.

For each user?

Keep a cookie with a number called 'server' or something. When the user visits, increment it by 1, unless it's already 4, in which case set it to 1.

Then just use the cookie in the server name when you go to pull data.