Random Example Transaction Code

random_code.php

$arr = [];

for($i = 0; $i < 10; $i++) {
  $num_rand = num_rand();
  if(!in_array($num_rand, $arr)) {
     $arr[] = $num_rand;
    }else{
     $num_rand = num_rand();
     $arr[] = $num_rand;
    }
}

function num_rand() {
  $num_rand = rand();
  $str_num_rand = substr((string)$num_rand,0,6)."MC";
  return $str_num_rand;
}

print_r($arr);