Home > php教程 > php手册 > body text

php生成固定长度纯数字编码的方法,php生成长度编码

WBOY
Release: 2016-06-13 08:58:21
Original
781 people have browsed it

php生成固定长度纯数字编码的方法,php生成长度编码

本文实例讲述了php生成固定长度纯数字编码的方法。分享给大家供大家参考。具体如下:

很多时候我们需要一些固定长度的数字编码,如订单编号、卡号、用户编号等等!但是经常我们有的是存储在数据库中的有序编号,我们可以通过它直接转成一个固定长度的数字编码,然后更新到数据库中形成此记录的唯一编号。

<&#63;php
/**
 * 根据日期或者是给定前缀生成唯一编号
 * User: minyifei.cn
 * Date: 15/7/7
 */
namespace Minyifei\Libs;
class SequenceNumber {
 /**
  * 根据显示宽度获取指定的 mapbit
  *
  * @param integer $width 编号显示宽度
  *
  * @return array
  */
 private static function _getMapbit($width)
 {
  $mapBits = array(
   4=>array(
    10, 2, 11, 3, 0, 1, 9, 7, 12, 6, 4, 8, 5,
   ),
   5=>array(
    4, 3, 13, 15, 7, 8, 6, 2, 1, 10, 5, 12, 0, 11, 14, 9,
   ),
   6=>array(
    2, 7, 10, 9, 16, 3, 6, 8, 0, 4, 1, 12, 11, 13, 18, 5, 15, 17, 14,
   ),
   7=>array(
    18, 0, 2, 22, 8, 3, 1, 14, 17, 12, 4, 19, 11, 9, 13, 5, 6, 15, 10, 16, 20, 7, 21,
   ),
   8=>array(
    11, 8, 4, 0, 16, 14, 22, 7, 3, 5, 13, 18, 24, 25, 23, 10, 1, 12, 6, 21, 17, 2, 15, 9, 19, 20,
   ),
   9=>array(
    24, 23, 27, 3, 9, 16, 25, 13, 28, 12, 0, 4, 10, 18, 11, 2, 17, 1, 21, 26, 5, 15, 7, 20, 22, 14, 19, 6, 8,
   ),
   10=>array(
    32, 3, 1, 28, 21, 18, 30, 7, 12, 22, 20, 13, 16, 15, 6, 17, 9, 25, 11, 8, 4, 27, 14, 31, 5, 23, 24, 29, 0, 10, 19, 26, 2,
   ),
   11=>array(
    9, 13, 2, 29, 11, 32, 14, 33, 24, 8, 27, 4, 22, 20, 5, 0, 21, 25, 17, 28, 34, 6, 23, 26, 30, 3, 7, 19, 16, 15, 12, 31, 1, 35, 10, 18,
   ),
   12=>array(
    31, 4, 16, 33, 35, 29, 17, 37, 12, 28, 32, 22, 7, 10, 14, 26, 0, 9, 8, 3, 20, 2, 13, 5, 36, 27, 23, 15, 19, 34, 38, 11, 24, 25, 30, 21, 18, 6, 1,
   ),
  );
  return $mapBits[intval($width)];
 }
 /**
  * 格式化给定时间戳
  *
  * @param integer $ts timestamp, if null use current timestamp
  *
  * @return string
  */
 private static function _fmtTS($ts=null)
 {
  $ts = $ts &#63;: time();
  return date(self::$_fmt, $ts);
 }
 /**
  * 根据id获取一个随机唯一编码
  * @param $id 编号
  * @param int $prefix 前缀
  * @param int $width 除前缀外长度
  * @return string
  */
 public static function generateNumber($id,$prefix=10,$width=8)
 {
  return sprintf("%s%s", $prefix,self::encode($id, $width));
 }
 /**
  * 编码转换
  *
  * @param integer $id id
  * @param integer $width 编号额外组成部分的显示宽度
  *
  * @return integer
  */
 public static function encode($id, $width)
 {
  $maximum = intval(str_repeat(9, $width));
  $superscript = intval(log($maximum) / log(2));
  $r = 0;
  $sign = 0x1 << $superscript;
  $id |= $sign;
  $mapbit = self::_getMapbit($width);
  for ($x = 0; $x < $superscript; $x++) {
   $v = ($id >> $x) & 0x1;
   $r |= ($v << $mapbit[$x]);
  }
  $r += $maximum - pow(2, $superscript) + 1;
  return sprintf("%0${width}s", $r);
 }
 /**
  * 获取唯一编号
  *
  * @param integer $id id, mostly database primary key
  * @param integer $width 编号显示宽度
  * @param integer $ts timestamp
  *
  * @return string
  */
 public static function get($id, $width, $ts=null)
 {
  return sprintf('%s%s', self::_fmtTS($ts), self::encode($id, $width));
 }
}

Copy after login

希望本文所述对大家的php程序设计有所帮助。

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!