PHP number and string ID mutual conversion function (similar to Youku ID)

PHP number and string ID mutual conversion function (similar to Youku ID)_PHP tutorial

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Release： 2016-07-13 10:26:17

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I don’t know if you’ve noticed, but other video links like Youku, Tencent Video, etc. seem to be similar to this

Copy code The code is as follows:

http://v.youku.com/v_show/id_XNjA5MjE5OTM2.html

Pay attention to the id_xxx part. You can’t understand it, but you can’t deny that this is the id. A foreign expert wrote a generation method for PHP/Python/Javascript/Java/SQL as early as 2009. It can be seen that I am so behind the times now, I will post the code below, hoping that the spirit of sharing will last forever.

Copy code The code is as follows:

/**
* @author   Kevin van Zonneveld
* @author   Simon Franz
* @author   Deadfish
* @copyright 2008 Kevin van Zonneveld (http://kevin.vanzonneveld.net)
* @license   http://www.opensource.org/licenses/bsd-license.php New BSD Licence
* @version   SVN: Release: $Id: alphaID.inc.php 344 2009-06-10 17:43:59Z kevin $
* @link   http://kevin.vanzonneveld.net/
*
* @param mixed   $in      String or long input to translate
* @param boolean $to_num Reverses translation when true
* @param mixed   $pad_up Number or boolean padds the result up to a specified length
* @param string $passKey Supplying a password makes it harder to calculate the original ID
*
* @return mixed string or long
*/
function alphaID($in, $to_num = false, $pad_up = false, $passKey = null)
{
  $index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  if ($passKey !== 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

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

      $passhash = hash('sha256',$passKey);
      $passhash = (strlen($passhash) < strlen($index))
          ? hash('sha512',$passKey)
          : $passhash;

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

      array_multisort($p, SORT_DESC, $i);
      $index = implode($i);
  }

  $base = strlen($index);

  if ($to_num) {
      // Digital number < 0) {
              $out -= pow($base, $pad_up);
          }
      }
      $out = sprintf('%F', $out);
      $out = substr($out, 0, strpos($out, '.'));
  } else {
      // Digital number -->> alphabet letter code
      if (is_numeric($pad_up)) {
          $pad_up--;
          if ($pad_up > 0) {
              $in += pow($base, $pad_up);
          }
      }

      $out = "";
      for ($t = floor(log($in, $base)); $t >= 0; $t--) {
          $bcp = bcpow($base, $t);
          $a   = floor($in / $bcp) % $base;
          $out = $out . substr($index, $a, 1);
          $in = $in - ($a * $bcp);
      }
      $out = strrev($out); // reverse
  }

  return $out;
}

使用举例

复制代码代码如下:

alphaID(9007199254740989);

The execution result will be returned "fE2XnNGpF", we can think of it as encryption, and decryption is

Copy code The code is as follows:

alphaID('fE2XnNGpF', true);

Then convert it into a real number "9007199254740989". The method can also support encryption using a key so that others cannot decipher your real ID.