core/library/think/cache/driver/Memcache.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\cache\driver;

use think\cache\Driver;

class Memcache extends Driver
{
    protected $options = [
        'host'       => '127.0.0.1',
        'port'       => 11211,
        'expire'     => 0,
        'timeout'    => 0, // 超时时间（单位：毫秒）
        'persistent' => true,
        'prefix'     => '',
    ];

    /**
     * 构造函数
     * @param array $options 缓存参数
     * @access public
     * @throws \BadFunctionCallException
     */
    public function __construct($options = [])
    {
        if (!extension_loaded('memcache')) {
            throw new \BadFunctionCallException('not support: memcache');
        }
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }
        $this->handler = new \Memcache;
        // 支持集群
        $hosts = explode(',', $this->options['host']);
        $ports = explode(',', $this->options['port']);
        if (empty($ports[0])) {
            $ports[0] = 11211;
        }
        // 建立连接
        foreach ((array) $hosts as $i => $host) {
            $port = isset($ports[$i]) ? $ports[$i] : $ports[0];
            $this->options['timeout'] > 0 ?
            $this->handler->addServer($host, $port, $this->options['persistent'], 1, $this->options['timeout']) :
            $this->handler->addServer($host, $port, $this->options['persistent'], 1);
        }
    }

    /**
     * 判断缓存
     * @access public
     * @param string $name 缓存变量名