php雪花算法SnowFlake生成唯一ID

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php雪花算法SnowFlake生成唯一ID

龙行 PHP 2019-6-5 5496 0评论

这个算法的好处很简单可以在每秒产生约400W个不同的16位数字ID(10进制)

demo1

<?php

/**
 * 雪花算法类
 * @package app\helpers
 */
class SnowFlake
{
    const EPOCH = 1479533469598;
    const max12bit = 4095;
    const max41bit = 1099511627775;

    static $machineId = null;

    public static function machineId($mId = 0) {
        self::$machineId = $mId;
    }

    public static function generateParticle() {
        /*
        * Time - 42 bits
        */
        $time = floor(microtime(true) * 1000);

        /*
        * Substract custom epoch from current time
        */
        $time -= self::EPOCH;

        /*
        * Create a base and add time to it
        */
        $base = decbin(self::max41bit + $time);


        /*
        * Configured machine id - 10 bits - up to 1024 machines
        */
        if(!self::$machineId) {
            $machineid = self::$machineId;
        } else {
            $machineid = str_pad(decbin(self::$machineId), 10, "0", STR_PAD_LEFT);
        }

        /*
        * sequence number - 12 bits - up to 4096 random numbers per machine
        */
        $random = str_pad(decbin(mt_rand(0, self::max12bit)), 12, "0", STR_PAD_LEFT);

        /*
        * Pack
        */
        $base = $base.$machineid.$random;

        /*
        * Return unique time id no
        */
        return bindec($base);
    }

    public static function timeFromParticle($particle) {
        /*
        * Return time
        */
        return bindec(substr(decbin($particle),0,41)) - self::max41bit + self::EPOCH;
    }
}

demo2

 public function createID(){
        //假设一个机器id
        $machineId = 1234567890;

        //41bit timestamp(毫秒)
        $time = floor(microtime(true) * 1000);

        //0bit 未使用
        $suffix = 0;

        //datacenterId  添加数据的时间
        $base = decbin(pow(2,40) - 1 + $time);

        //workerId  机器ID
        $machineid = decbin(pow(2,9) - 1 + $machineId);

        //毫秒类的计数
        $random = mt_rand(1, pow(2,11)-1);

        $random = decbin(pow(2,11)-1 + $random);
        //拼装所有数据
        $base64 = $suffix.$base.$machineid.$random;
        //将二进制转换int
        $base64 = bindec($base64);

        $id = sprintf('%.0f', $base64);

        return $id;
    }

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