<?php
function khash($data)
{ // Similar to https://www.php.net/manual/fr/function.crc32.php#111931
    static $map = "ABCDEFGHJKLMNPRSTUXYZ";
    $maplen = strlen($map);
    $hash = bcadd(sprintf('%u',crc32($data)) , 0x100000000);
    $str = "";
    do
    {
        $str = $map[bcmod($hash, $maplen) ] . $str;
        $hash = bcdiv($hash, $maplen);
    }
    while ($hash >= 1);
    return $str;
}

$hash = 'MySecretHashKey';
$collisions = [];

$collisions['ENGOUSEF'] = 0xdead;
$i = 1;
while(true)
{
  $data = $hash.$i;
  $h = khash($data);
  if (isset($collisions[$h]))
    die("Collisions $h");
  $collisions[$h] = $i;
  if ($i%1000 == 0)
    echo "$i -> $h\n";
  $i++;
}