46 lines
1.5 KiB
PHP
46 lines
1.5 KiB
PHP
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<?php
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/**
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* 分布式 id 生成类 组成: <毫秒级时间戳+机器id+序列号>
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* 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
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* @author zhangqi
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* @link https://www.cnblogs.com/njccqx/p/13402169.html
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*/
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class SnowFlake
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{
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const EPOCH = 1479533469598; //开始时间,固定一个小于当前时间的毫秒数
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const max12bit = 4095;
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const max41bit = 1099511627775;
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static $machineId = 1; // 机器id
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public static function machineId($mId = 0)
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{
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self::$machineId = $mId;
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}
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public static function createOnlyId()
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{
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// 时间戳 42字节
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$time = floor(microtime(true) * 1000);
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// 当前时间 与 开始时间 差值
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$time -= self::EPOCH;
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// 二进制的 毫秒级时间戳
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$base = decbin(self::max41bit + $time);
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// 机器id 10 字节
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if (!self::$machineId) {
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$machineid = self::$machineId;
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} else {
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$machineid = str_pad(decbin(self::$machineId), 10, "0", STR_PAD_LEFT);
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}
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// 序列数 12字节
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$random = str_pad(decbin(mt_rand(0, self::max12bit)), 12, "0", STR_PAD_LEFT);
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// 拼接
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$base = $base . $machineid . $random;
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// 转化为 十进制 返回
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return bindec($base);
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}
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}
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// SnowFlake::machineId("1"); //机器编号
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// echo SnowFlake::createOnlyId();//分布式id
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