PHP数字和字符串ID互转函数(类似优酷ID)
这篇文章主要介绍了PHP数字和字符串ID互转函数,生成的字符串ID类似优酷的视频ID,像一个加密过的数字ID,本文函数可以在数字ID和字符串ID间相互转换,需要的朋友可以参考下。
不知道你注意了没有,类似优酷、腾讯视频等其他视频链接似乎类似这样的,代码如下:
http://v.youku.com/v_show/id_XNjA5MjE5OTM2.html
注意id_xxx那段,是不是看不懂了,但你无可否认这个就是id,这不国外的一位牛人早在09年就写了针对PHP/Python/Javascript/Java/SQL的生成方法,可见我现在是多么的落伍,下面我把代码贴出来,希望分享精神永存,代码如下:
- <?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 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; $n<strlen($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;
- }
使用举例,代码如下:
alphaID(9007199254740989);
执行结果将被返回“fE2XnNGpF”,我们可以把它认为是加密,进行反解密则,代码如下:
alphaID('fE2XnNGpF', true);
那么就转换成真实的数字“9007199254740989”。方法还可以支持使用key进行加密,使得别人无法解得你真实的ID。