PHP-雪花算法根据主键id或时间生成唯一编码
自用编码生成代码，可以根据用户id或者订单id生成唯一编码，很方便不会重复，不用去数据库查重。
如果是分布式怕并发，可以搭配使用雪花算法生成唯一id
1：根据主键1生成9位长度的唯一编码：第一个参数是id，第二个参数是可以设置前缀，比如字母，第三个参数是长度(4-12)位#
$user_id = '1';
OnlyCode::generateNumber($user_id, '', 9);
结果：
479906304
2：根据时间戳生成编码：第一个参数是id，第二个参数是长度(4-12)位，第三个参数是时间格式(默认是 ymdhis)#
$user_id = '1';
OnlyCode::get($user_id, 9);
结果：
211209053412479906304
3：雪花算法生成唯一id，分布式或负载均衡的需要分别设置机器id#
OnlyCode::createOnlyId();
4：代码奉上#
复制代码
<?php
/**
* 根据日期或者是给定前缀生成唯一编号,或者根据雪花算法生成唯一id
* User: wekyun
* Date: 2021/12/9
*/
namespace lib;
class OnlyCode
{
/**
* 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
* https://www.jb51.net/article/69248.htm
* @param integer $tf time format, if null use current time format
* @return string
*/
private static function _fmtTS($tf)
{
return date($tf, time());
}
/**
* 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, $width = 8)
{
if ($width >= 4 && $width <= 12) {
return sprintf("%s%s", $prefix, self::encode($id, $width));
}
return false;
}
/**
* 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);
}
/**
* 根据时间生成获取唯一编号
* @param integer $id id, mostly database primary key
* @param integer $width 编号显示宽度
* @param integer $tf time format
*
* @return string
*/
public static function get($id, $width, $tf = 'ymdhis')
{
if ($width >= 4 && $width <= 12) {
return sprintf('%s%s', self::_fmtTS($tf), self::encode($id, $width));
}
return false;
}
/**
* 雪花算法生成唯一id
* */
const EPOCH = 1639040170957; //开始时间,固定一个小于当前时间的毫秒数\ 1479533469598
const max12bit = 4095;
const max41bit = 1099511627775;
private static $machineId = 10; // 机器id
public static function machineId($mId = 0)
{
self::$machineId = $mId;
}
//雪花算法
public static function createOnlyId($len = 16)
{
// 时间戳 42字节
$time = floor(microtime(true) * 1000);
// 当前时间 与 开始时间 差值
$time -= self::EPOCH;
// 二进制的 毫秒级时间戳
$base = decbin(self::max41bit + $time);
// 机器id 10 字节
if (!self::$machineId) {
$machineid = self::$machineId;
} else {
$machineid = str_pad(decbin(self::$machineId), 10, "0", STR_PAD_LEFT);
}
// 序列数 12字节
$random = str_pad(decbin(mt_rand(0, self::max12bit)), 12, "0", STR_PAD_LEFT);
// 拼接
$base = $base . $machineid . $random;
// 转化为 十进制 返回
return bindec($base);
}
}
