Discussion on: Challenge: find 'Kaprekar numbers'

<?php

$kaprekarNumbers = array();
$i = 1;

while (count ($kaprekarNumbers) < 8) {

  $square = $i * $i;

  $splitLength = round(strlen((string)$square) / 2, 0, PHP_ROUND_HALF_DOWN);

  $splitFront = substr((string)$square, 0, $splitLength);
  $splitBack = substr((string)$square, $splitLength - strlen((string)$square));

  if ((int)$splitFront+(int)$splitBack == $i) {
    $kaprekarNumbers[] = $i;
  }

  $i++;
}

echo "\n\n".implode(",",$kaprekarNumbers)."\n\n";

?>