<?php
//封裝一個hash演算法類
class Mem{
    //儲存memcache的伺服器個數
    private $hostCount='';
    //多個伺服器
    private $host=[];

    //構造方法用來給接收值，給屬性賦值
    public function __construct($hostServer)
    {
        $this->hostCount = count($hostServer);
        $this->host = $hostServer;
    }

    //計算key的位置，返回的是當前是第幾臺伺服器
 

    public function position($key){
        echo sprintf('%u',crc32($key))%$this->hostCount;//取餘數
        return sprintf('%u',crc32($key))%$this->hostCount;
    }

    //根據取到的位置獲取當前memcache物件,連結memcache
    public function getMemObj($position){
        //在伺服器池中獲取某一臺的地址和埠號
        $host=$this->host[$position
 
]['host'];
        $port=$this->host[$position]['port'];
        $MemObj = new Memcache();
        $MemObj->addServer($host,$port);
        return $MemObj;
    }

    //設定值
    public function SetData($key,$value){
        //找到伺服器位置
        $num = $this->position($key);
        //連線伺服器
        $m
 
 = $this->getMemObj($num);
        return $m->set($key,$value);
    }

    public function GetData($key){
        //找到伺服器位置
        $num = $this->position($key);
        //連線伺服器
        $m = $this->getMemObj($num);
        return $m->get($key);

    }
}

$host = [
    [
        'host'=>'127.0.0.1',
        'port'=>'11211'
    ],
    [
        'host'=>'127.0.0.2',
        'port'=>'11212'
    ]
];
$obj = new Mem($host);
$obj->position('sex');