How to check multiple values not same

[Mudsaf]

example i got this script $a = rand(1, 4);$b = rand(1, 4);$c = rand(1, 4);.. more values $a2 = rand(1, 20);$b2 = rand(1, 20);$c2 = rand(1, 20);...more values how do i make script that checks that for every value

if ($a <> $b && $a2 <> $b2 {  }

whitout having to do million values listed. So i dont want any $a && a2 values to be same as any other for example $b && b2. I guess its pretty hard to explain but lets assume i have deck of cards and i dont want same card with same color twice there.

Edited January 16, 2013 by Mudsaf

[jeffman]

May a suggest a different approach? Fill an array with the values you need, then shuffle it.

$nums = range(1,20);shuffle($nums);