Coin problem from FiveThirtyEight

coin-problem.php

<?php

$coins = array_fill(0,100,'h');

// We need to loop n times, where n == the length of the array
for ($counter = 1; $counter <= count($coins); $counter++) {
// We need to go through each element in the array, testing
// it's position and changing it if it meets the requirements

  foreach($coins as $position => $coin) {
    if (($position + 1) % $counter == 0) {
      if ($coin === 'h') {
        $coins[$position] = 't';
      } else {
        $coins[$position] = 'h';
      }
    }
  }
}

// Simply for testing, turn the array into a string
$coin_string = implode(', ', $coins);
// And return that string to the console
echo $coin_string;