PHP: Multiple Unique Random Integers In A Specific Range

I want to create 8 random integers, that are unique and in the range between 0 and 99.

Is there a neater solution, than the one that I thought of?

<?php


do {

  $rnd1 = rand(0,99);
  $rnd2 = rand(0,99);
  $rnd3 = rand(0,99);
  $rnd4 = rand(0,99);
  $rnd5 = rand(0,99);
  $rnd6 = rand(0,99);

} while (($rnd1 == $rnd2) || 
         ($rnd1 == $rnd3) || 
         ($rnd1 == $rnd4) || 
         ($rnd1 == $rnd5) || 
         ($rnd1 == $rnd6) || 
         ($rnd2 == $rnd3) || 
         ($rnd2 == $rnd4) || 
         ($rnd2 == $rnd5) || 
         ($rnd2 == $rnd6) || 
         ($rnd3 == $rnd4) || 
         ($rnd3 == $rnd5) || 
         ($rnd3 == $rnd6) || 
         ($rnd4 == $rnd5) || 
         ($rnd4 == $rnd6) || 
         ($rnd5 == $rnd6)    );


?>