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| 2.6.5 | ||
| 2.6.6 |
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| <?php | ||
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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> | ||
| * 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; | ||
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| static $machineId = 1; // 机器id | ||
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| public static function machineId($mId = 0) | ||
| { | ||
| self::$machineId = $mId; | ||
| } | ||
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| 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 |
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