core/library/think/session/driver/Memcached.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\session\driver;

use SessionHandler;
use think\Exception;

class Memcached extends SessionHandler
{
    protected $handler = null;
    protected $config  = [
        'host'         => '127.0.0.1', // memcache主机
        'port'         => 11211, // memcache端口
        'expire'       => 3600, // session有效期
        'timeout'      => 0, // 连接超时时间（单位：毫秒）
        'session_name' => '', // memcache key前缀
        'username'     => '', //账号
        'password'     => '', //密码
    ];

    public function __construct($config = [])
    {
        $this->config = array_merge($this->config, $config);
    }

    /**
     * 打开Session
     * @access public
     * @param string    $savePath
     * @param mixed     $sessName
     */
    public function open($savePath, $sessName)
    {
        // 检测php环境
        if (!extension_loaded('memcached')) {
            throw new Exception('not support:memcached');
        }
        $this->handler = new \Memcached;
        // 设置连接超时时间（单位：毫秒）
        if ($this->config['timeout'] > 0) {
            $this->handler->setOption(\Memcached::OPT_CONNECT_TIMEOUT, $this->config['timeout']);
        }
        // 支持集群
        $hosts = explode(',', $this->config['host']);
        $ports = explode(',', $this->config['port']);
        if (empty($ports[0])) {
            $ports[0] = 11211;
        }
        // 建立连接
        $servers = [];
        foreach ((array) $hosts as $i => $host) {