<?php

function unhash($h) {  
    $letters = "acegikmnoprstuvy";
    //new string return 
    $s='';
    while ($h>7){
        //hold
        $pos = fmod($h, 37);
        $s = $letters[$pos].$s;
        $h = ($h-$pos) / 37 ;
    }
    return $s;
}
$something = unhash("leepadg");
echo $something