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本篇内容主要讲解“怎么用PHP实现雪花算法”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“怎么用PHP实现雪花算法”吧!
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$this->maxWorkerId || $workerId < 0) { throw new Exception("worker Id can't be greater than {$this->maxWorkerId} or less than 0"); } if ($datacenterId > $this->maxDatacenterId || $datacenterId < 0) { throw new Exception("datacenter Id can't be greater than {$this->maxDatacenterId} or less than 0"); } $this->workerId = $workerId; $this->datacenterId = $datacenterId; $this->sequence = $sequence; } public function createId() { $timestamp = $this->createTimestamp(); if ($timestamp < $this->lastTimestamp) {//当产生的时间戳小于上次的生成的时间戳时,报错 $diffTimestamp = bcsub($this->lastTimestamp, $timestamp); throw new Exception("Clock moved backwards. Refusing to generate id for {$diffTimestamp} milliseconds"); } if ($this->lastTimestamp == $timestamp) {//当生成的时间戳等于上次生成的时间戳的时候 $this->sequence = ($this->sequence + 1) & $this->sequenceMask;//序列自增一次 if (0 == $this->sequence) {//当序列为0时,重新生成最新的时间戳 $timestamp = $this->createNextTimestamp($this->lastTimestamp); } } else {//当生成的时间戳不等于上次的生成的时间戳的时候,序列归0 $this->sequence = 0; } $this->lastTimestamp = $timestamp; return (($timestamp - self::TWEPOCH) << $this->timestampLeftShift) | ($this->datacenterId << $this->datacenterIdShift) | ($this->workerId << $this->workerIdShift) | $this->sequence; } protected function createNextTimestamp($lastTimestamp) //生成一个大于等于 上次生成的时间戳 的时间戳 { $timestamp = $this->createTimestamp(); while ($timestamp <= $lastTimestamp) { $timestamp = $this->createTimestamp(); } return $timestamp; } protected function createTimestamp()//生成毫秒级别的时间戳 { return floor(microtime(true) * 1000); } } ?>
到此,相信大家对“怎么用PHP实现雪花算法”有了更深的了解,不妨来实际操作一番吧!这里是创新互联网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!
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