rack.php

<?php

function generate_rack($n){
  $tileBag = "AAAAAAAAABBCCDDDDEEEEEEEEEEEEFFGGGHHIIIIIIIIIJKLLLLMMNNNNNNOOOOOOOOPPQRRRRRRSSSSTTTTTTUUUUVVWWXYYZ";
  $rack_letters = substr(str_shuffle($tileBag), 0, $n);
  
  $temp = str_split($rack_letters);
  sort($temp);
  return implode($temp);
};

echo generate_rack(7);

?>