phpinfo.php

<?php

/**
 * Created by PhpStorm.
 * User: envon
 * Date: 2016/10/27
 * Time: 17:17
 */

/*class IdWork
{

//开始时间,固定一个小于当前时间的毫秒数即可
const twepoch =  1474992000000;//2016/9/28 0:0:0

//机器标识占的位数
const workerIdBits = 10;

//毫秒内自增数点的位数
const sequenceBits = 12;

protected $workId = 0;

//要用静态变量
static $lastTimestamp = -1;
static $sequence = 0;


function __construct($workId){
//机器ID范围判断
$maxWorkerId = -1 ^ (-1 << self::workerIdBits);
if($workId > $maxWorkerId || $workId< 0){
throw new Exception("workerId can't be greater than ".$this->maxWorkerId." or less than 0");
}
//赋值
$this->workId = $workId;
}

//生成一个ID
public function nextId(){
$timestamp = $this->timeGen();
$lastTimestamp = self::$lastTimestamp;
//判断时钟是否正常
if ($timestamp < $lastTimestamp) {
throw new Exception("Clock moved backwards.  Refusing to generate id for %d milliseconds", ($lastTimestamp - $timestamp));
}
//生成唯一序列
if ($lastTimestamp == $timestamp) {
$sequenceMask = -1 ^ (-1 << self::sequenceBits);
self::$sequence = (self::$sequence + 1) & $sequenceMask;
if (self::$sequence == 0) {
$timestamp = $this->tilNextMillis($lastTimestamp);
}
} else {
self::$sequence = 0;
}
self::$lastTimestamp = $timestamp;
//
//时间毫秒/数据中心ID/机器ID,要左移的位数
$timestampLeftShift = self::sequenceBits + self::workerIdBits;
$workerIdShift = self::sequenceBits;
//组合3段数据返回: 时间戳.工作机器.序列
$nextId = (($timestamp - self::twepoch) << $timestampLeftShift) | ($this->workId << $workerIdShift) | self::$sequence;
return $nextId;
}

//取当前时间毫秒
protected function timeGen(){
$timestramp = (float)sprintf("%.0f", microtime(true) * 1000);
return  $timestramp;
}

//取下一毫秒
protected function tilNextMillis($lastTimestamp) {
$timestamp = $this->timeGen();
while ($timestamp <= $lastTimestamp) {
$timestamp = $this->timeGen();
}
return $timestamp;
}

}


//调用
header("Content-Type: text/html; charset=utf-8");
$work = new IdWork(1023);
for($i=0; $i<10;$i++) {
$id = $work->nextId();
echo $id . "<br>";
}*/




class IdWork
{

    //开始时间,固定一个小于当前时间的毫秒数即可
    const twepoch =  1474992000000;//2016/9/28 0:0:0

    //机器标识占的位数
    const workerIdBits = 5;

    //数据中心标识占的位数
    const datacenterIdBits = 5;

    //毫秒内自增数点的位数
    const sequenceBits = 12;

    protected $workId = 0;
    protected $datacenterId = 0;

    static $lastTimestamp = -1;
    static $sequence = 0;


    function __construct($workId, $datacenterId){
        //机器ID范围判断
        $maxWorkerId = -1 ^ (-1 << self::workerIdBits);
        if($workId > $maxWorkerId || $workId< 0){
            throw new Exception("workerId can't be greater than ".$this->maxWorkerId." or less than 0");
        }
        //数据中心ID范围判断
        $maxDatacenterId = -1 ^ (-1 << self::datacenterIdBits);
        if ($datacenterId > $maxDatacenterId || $datacenterId < 0) {
            throw new Exception("datacenter Id can't be greater than ".$maxDatacenterId." or less than 0");
        }
        //赋值
        $this->workId = $workId;
        $this->datacenterId = $datacenterId;
    }

    //生成一个ID
    public function nextId(){
        $timestamp = $this->timeGen();
        $lastTimestamp = self::$lastTimestamp;
        //判断时钟是否正常
        if ($timestamp < $lastTimestamp) {
            throw new Exception("Clock moved backwards.  Refusing to generate id for %d milliseconds", ($lastTimestamp - $timestamp));
        }
        //生成唯一序列
        if ($lastTimestamp == $timestamp) {
            $sequenceMask = -1 ^ (-1 << self::sequenceBits);
            self::$sequence = (self::$sequence + 1) & $sequenceMask;
            if (self::$sequence == 0) {
                $timestamp = $this->tilNextMillis($lastTimestamp);
            }
        } else {
            self::$sequence = 0;
        }
        self::$lastTimestamp = $timestamp;
        //
        //时间毫秒/数据中心ID/机器ID,要左移的位数
        $timestampLeftShift = self::sequenceBits + self::workerIdBits + self::datacenterIdBits;
        $datacenterIdShift = self::sequenceBits + self::workerIdBits;
        $workerIdShift = self::sequenceBits;
        //组合4段数据返回: 时间戳.数据标识.工作机器.序列
        $nextId = (($timestamp - self::twepoch) << $timestampLeftShift) |
            ($this->datacenterId << $datacenterIdShift) |
            ($this->workId << $workerIdShift) | self::$sequence;
        return $nextId;
    }

    //取当前时间毫秒
    protected function timeGen(){
        $timestramp = (float)sprintf("%.0f", microtime(true) * 1000);
        return  $timestramp;
    }

    //取下一毫秒
    protected function tilNextMillis($lastTimestamp) {
        $timestamp = $this->timeGen();
        while ($timestamp <= $lastTimestamp) {
            $timestamp = $this->timeGen();
        }
        return $timestamp;
    }

}


//调用
header("Content-Type: text/html; charset=utf-8");
$work = new IdWork(31,31);
for($i=0; $i<10;$i++) {
    $id = $work->nextId();
    echo $id . "<br>";
}