How to make "randomly" $reward?

Hi, me need "random" $reward, I make code:

PHP:

   $itemreward = rand(1, 3);

   if($itemreward = 1){
   $reward = new Item(rand(256, 321));
   }

   if($itemreward = 2){
   $reward = new Item(rand(1, 22));
   }

   if($itemreward = 3){
   $reward = new Item(rand(41, 52));
   }


It not works and my plugin use last $reward value...
Who knew how to make working "random" values?

Use === to compare, not =.
Also, use Item::get($id) not new Item($id).
Also, use mt_rand() rather than rand(); that's faster.

Thanks, I try it...

I use compare with === and server told me:
Undefined variable: itemreward...

= for variable assignment
=== for comparing whether they are equal.

Ok, I try it too...

Thanks a lot!
I have done LuckyBlocks plugin <3