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@ 2016-02-02T13:45:33Z

<?php

echo alphaID('B3333V', true, 6, '3gmgkvj0jw8hrkcnu');

function alphaID($in, $to_num = false, $pad_up = false, $pass_key = null) {
  $out   =   '';
  $index = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  $base  = strlen($index);
  if ($pass_key !== null) {
    // Although this function's purpose is to just make the
    // ID short - and not so much secure,
    // with this patch by Simon Franz (http://blog.snaky.org/)
    // you can optionally supply a password to make it harder
    // to calculate the corresponding numeric ID
    $i = str_split($index);
    $pass_hash = hash('sha256',$pass_key);
    $pass_hash = (strlen($pass_hash) < strlen($index) ? hash('sha512', $pass_key) : $pass_hash);
    $pass_hash = substr($pass_hash, 0, strlen($index));
    $p = str_split($pass_hash);
    array_multisort($p, SORT_DESC, $i);
    $index = implode($i);
  }
  if ($to_num) {
    // Digital number  <<--  alphabet letter code
    $len = strlen($in) - 1;
    for ($t = $len; $t >= 0; $t--) {
      $bcp = bcpow($base, $len - $t);
      $out = $out + strpos($index, substr($in, $t, 1)) * $bcp;
    }
    if (is_numeric($pad_up)) {
      $pad_up--;
      if ($pad_up > 0) {
        $out -= pow($base, $pad_up);
      }
    }
  } else {
    // Digital number  -->>  alphabet letter code
    if (is_numeric($pad_up)) {
      $pad_up--;
      if ($pad_up > 0) {
        $in += pow($base, $pad_up);
      }
    }
    for ($t = ($in != 0 ? floor(log($in, $base)) : 0); $t >= 0; $t--) {
      $bcp = bcpow($base, $t);
      $a   = floor($in / $bcp) % $base;
      $out = $out . substr($index, $a, 1);
      $in  = $in - ($a * $bcp);
    }
  }
  return $out;
}

Output for 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /in/fKK50:28 Stack trace: #0 /in/fKK50(3): alphaID('B3333V', true, 6, '3gmgkvj0jw8hrkc...') #1 {main} thrown in /in/fKK50 on line 28
Process exited with code 255.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /in/fKK50:28 Stack trace: #0 /in/fKK50(3): alphaID('B3333V', true, 6, '3gmgkvj0jw8hrkc...') #1 {main} thrown in /in/fKK50 on line 28
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33, 8.0.13: Fatal error: Uncaught Error: Call to undefined function bcpow() in /in/fKK50:27 Stack trace: #0 /in/fKK50(3): alphaID('B3333V', true, 6, '3gmgkvj0jw8hrkc...') #1 {main} thrown in /in/fKK50 on line 27
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32: Warning: A non-numeric value encountered in /in/fKK50 on line 28 7
Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33: 7
Output for 5.5.0 - 5.5.38: Fatal error: Call to undefined function bcpow() in /in/fKK50 on line 27
Process exited with code 255.

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