#PHP Numeric to Alphabet OR Alphabet to Numeric function very simple

numalpha.php

<?php
function numalpha($value) {
  if (ctype_digit((string) $value)) {
    return strtr(base_convert($value, 10, 36), '0123456789', 'ABCDEFGHIJ');
  } elseif (ctype_alpha($value)) {
    return base_convert(strtr($value, 'ABCDEFGHIJ', '0123456789'), 36, 10);
  }
  return false;
}

/*
- Usage -

$num = '321654987';
$toStr = numalpha($num);
$toNum = numalpha($toStr);
var_dump([
	'origin' => $num,
	'toStr' => $toStr,
	'toNum' => $toNum
]);


- Result -

array(3) {
  ["origin"]=> string(9) "321654987"
  ["toStr"]=> string(6) "FbiGkr"
  ["toNum"]=> string(9) "321654987"
}
*/