Digi92

<?php

function getNameFromNumber($num) {
    $numeric = $num % 26;
    $letter = chr(65 + $numeric);
    $num2 = intval($num / 26);
    if ($num2 > 0) {
        return $this->getNameFromNumber($num2 - 1) . $letter;
    } else {
        return $letter;

terox

function letterFromNumber = function( number ) {
  var letter = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.charAt(number % 26)
  var concat = Math.round(number / 26);
  return concat > 0 ? letterFromNumber(concat-1) + letter : letter;
};