EasyImages2.0/app/class.snowflake.php

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<?php
/**
* 分布式 id 生成类 组成: <毫秒级时间戳+机器id+序列号>
* 默认情况下41bit的时间戳可以支持该算法使用到2082年10bit的工作机器id可以支持1023台机器序列号支持1毫秒产生4095个自增序列id
* @author zhangqi
* @link https://www.cnblogs.com/njccqx/p/13402169.html
*/
class SnowFlake
{
const EPOCH = 1479533469598; //开始时间,固定一个小于当前时间的毫秒数
const max12bit = 4095;
const max41bit = 1099511627775;
static $machineId = 1; // 机器id
public static function machineId($mId = 0)
{
self::$machineId = $mId;
}
public static function createOnlyId()
{
// 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);
}
}
// SnowFlake::machineId("1"); //机器编号
// echo SnowFlake::createOnlyId();//分布式id