Sorry about that... ok, forget have of what I said up there ^.
The code that would prove my example is this:
<?php
srand(5);
echo(rand(1, 10));
srand(5);
echo(rand(1, 10));
srand(5);
echo(rand(1, 10));
?>
Each time you SHOULD get the same answer, but if you did this:
<?php
srand(5);
echo(rand(1, 10));
echo(rand(1, 10));
echo(rand(1, 10));
?>
then the answers would be different, and you'd be letting the random number formula do it's duty.