PHP numeric and String ID reciprocal function (similar to Youku ID) _php instance

I don't know if you noticed. No, like Youku, Tencent video and other video links seem like this

Copy Code code as follows:

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

Pay attention to id_xxx that paragraph, is not understand, but you can not deny that this is the ID, this is not a cow abroad in 09 to write on the php/python/javascript/java/sql of the generation method, can be seen how I am now outdated, the following I posted the code, Hope to share the spirit forever.

Copy Code code as follows:

<?php
/**
* @author Kevin van Zonneveld <kevin@vanzonneveld.net>
* @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 was to just make the
ID Short-and isn't so much secure,
With the patch by Simon Franz (http://blog.snaky.org/)
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);
}

$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;
}

Use examples

Copy Code code as follows:

<?php
Alphaid (9007199254740989);

The execution result will be returned to "FE2XNNGPF" and we can think of it as encryption, and the reverse decryption

Copy Code code as follows:

<?php
Alphaid (' fe2xnngpf ', true);

Then convert it into the real number "9007199254740989". Method can also support the use of key encryption, so that others can not solve your real ID.