HELP - function rand()

Hi, all! I'd like to know why the function rand() always returns the lowest number in my local server, and when I take it to my server on the WEB, it works perfectly. Every time I reload my page running my local server, this function returns the same result, and in my WEB server, it works. For exemple: Running Apache in my computer (localhost): echo rand(0,10); -- Always return 0. Running Apache in my WEB server, in other machine: echo rand(0,10); -- returns at first 4, then 2, then 9, then 7... Other exemple: Running Apache in my computer (localhost): for ($x=0;$x<4;$x++) {echo rand(0,10);} -- ALWAYS returns 0 (the first is always the lowest number)275. Even if I reload it, this will be the same result (0, 2, 7 and 5). Just when I restart the webserver, it changes. Running Apache in my WEB server, in other machine: for ($x=0;$x<4;$x++) {echo rand(0,10);} -- At the first time: 8190. The second: 5513, and always different. If someone could explain me, please do that. Thanks! Thales Medeiros.