serialized-unique-id.php

<?php
// LINK
// https://kvz.io/create-short-ids-with-php-like-youtube-or-tinyurl.html

echo alphaID(8503056, TRUE);

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 (https://blog.snaky.org/)
    // you can optionally supply a password to make it harder
    // to calculate the corresponding numeric ID

    for ($n = 0; $n < strlen($index); $n++) {
      $i[] = substr($index, $n, 1);
    }

    $pass_hash = hash('sha256',$pass_key);
    $pass_hash = (strlen($pass_hash) < strlen($index) ? hash('sha512', $pass_key) : $pass_hash);

    for ($n = 0; $n < strlen($index); $n++) {
      $p[] =  substr($pass_hash, $n, 1);
    }

    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;
}


echo alphaID(9007199254740989);
// will return PpQXn7COf and:
echo alphaID('PpQXn7COf', true);
// will return 9007199254740989
?>

serialized-unique-string-id.js

// LINK
// https://kvz.io/create-short-ids-with-php-like-youtube-or-tinyurl.html

/**
 *  Javascript AlphabeticID class
 *  (based on a script by Kevin van Zonneveld <[email protected]>)
 *
 *  Author: Even Simon <[email protected]>
 *
 *  Description: Translates a numeric identifier into a short string and backwords.
 *
 *  Usage:
 *    var str = AlphabeticID.encode(9007199254740989); // str = 'fE2XnNGpF'
 *    var id = AlphabeticID.decode('fE2XnNGpF'); // id = 9007199254740989;
 **/

var AlphabeticID = {
  index:'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ',

  /**
   *  [@function](https://twitter.com/function) AlphabeticID.encode
   *  [@description](https://twitter.com/description) Encode a number into short string
   *  [@param](https://twitter.com/param) integer
   *  [@return](https://twitter.com/return) string
   **/
  encode:function(_number){
    if('undefined' == typeof _number){
      return null;
    }
    else if('number' != typeof(_number)){
      throw new Error('Wrong parameter type');
    }

    var ret = '';

    for(var i=Math.floor(Math.log(parseInt(_number))/Math.log(AlphabeticID.index.length));i>=0;i--){
      ret = ret + AlphabeticID.index.substr((Math.floor(parseInt(_number) / AlphabeticID.bcpow(AlphabeticID.index.length, i)) % AlphabeticID.index.length),1);
    }

    return ret.reverse();
  },

  /**
   *  [@function](https://twitter.com/function) AlphabeticID.decode
   *  [@description](https://twitter.com/description) Decode a short string and return number
   *  [@param](https://twitter.com/param) string
   *  [@return](https://twitter.com/return) integer
   **/
  decode:function(_string){
    if('undefined' == typeof _string){
      return null;
    }
    else if('string' != typeof _string){
      throw new Error('Wrong parameter type');
    }

    var str = _string.reverse();
    var ret = 0;

    for(var i=0;i<=(str.length - 1);i++){
      ret = ret + AlphabeticID.index.indexOf(str.substr(i,1)) * (AlphabeticID.bcpow(AlphabeticID.index.length, (str.length - 1) - i));
    }

    return ret;
  },

  /**
   *  [@function](https://twitter.com/function) AlphabeticID.bcpow
   *  [@description](https://twitter.com/description) Raise _a to the power _b
   *  [@param](https://twitter.com/param) float _a
   *  [@param](https://twitter.com/param) integer _b
   *  [@return](https://twitter.com/return) string
   **/
  bcpow:function(_a, _b){
    return Math.floor(Math.pow(parseFloat(_a), parseInt(_b)));
  }
};

/**
 *  [@function](https://twitter.com/function) String.reverse
 *  [@description](https://twitter.com/description) Reverse a string
 *  [@return](https://twitter.com/return) string
 **/
String.prototype.reverse = function(){
  return this.split('').reverse().join('');
};