<?php


    $a1 = "123";
    $a2 = "213";
    $a3 = "312";
    $a4 = "222";
    $a5 = "333";
    $a6 = "444";



    $yyy1 = "123";
    $yyy2 = "213";
    $yyy3 = "312";
    $yyy4 = "222";
    $yyy5 = "333";
    $yyy6 = "444";



    do
    {
      $ggg = rand(1,6);
      $dd = "a".$ggg;

      $yuy = rand(1,6);
      $gecy = "yyy".$yuy;

       $ilkyazi = $$dd;
       $ikinciyazi = $$gecy;

    }
    while ($ilkyazi == $ikinciyazi);

    echo $ilkyazi . '<br>' . $ikinciyazi;


?>