php生成固定长度纯数字编码的方法
author:一佰互联 2019-04-27   click:265

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。

<?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 MinyifeiLibs;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 = $ts ?: time();  return date(self::$_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)); }}

希望本文所述对大家的php程序设计有所帮助。