How to generate a fixed-length pure numeric code in php, generate a length code in php

How to generate a fixed-length pure numeric code in php, generate a length code in php_PHP tutorial

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Release： 2016-07-13 09:46:55

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How to generate a fixed-length pure numeric code in php, how to generate a fixed-length pure numeric code in php

The example in this article describes how to generate a fixed-length pure numeric code in php. Share it with everyone for your reference. The details are as follows:

Many times we need some fixed-length numeric codes, such as order numbers, card numbers, user numbers, etc.! But often what we have is an ordered number stored in the database, which we can directly convert into a fixed-length numeric code, and then update it to the database to form a unique number for this record.

<&#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));
 }
}

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