converting a number base 10 to base 62 (a-zA-Z0-9)

Question

I have a number in base 10. Is there anyway to translate it to a base 62?

Example:

echo convert(12324324);
// returns Yg3 (fantasy example here)
         


        

Answer 1

A simpler (and possibly faster) implementation that does not use pow nor log:

function base62($num) {
  $index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
  $res = '';
  do {
    $res = $index[$num % 62] . $res;
    $num = intval($num / 62);
  } while ($num);
  return $res;
}