Random number from a set of three numbers

[kamy99]

Hi:

Could someone tell me how to make a random selection , from a preset amout of numbers or IDs?

For example:
I have number 3, 99, 624 I want to select one randomly.

Or I have ID1, ID25, ID77 , and I need to select one randomly.

Thanx
Kamy

[hand]

<?
$id[] = 3;
$id[] = 99;
$id[] = 624;

srand ((double)microtime()*1000000);
$randval = rand(0,count($id)-1);

print "RandomId1# is $id[$randval]<br>\n";
?>

<?
$id[] = "ID1";
$id[] = "ID25";
$id[] = "ID77";

srand ((double)microtime()*1000000);
$randval = rand(0,count($id)-1);

print "RandomId2# is $id[$randval]<br>\n";
?>