thinkphp/library/think/cache/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\cache\driver;

use think\cache\Driver;

class Memcached extends Driver
{
    protected $options = [
        'host'     => '127.0.0.1',
        'port'     => 11211,
        'expire'   => 0,
        'timeout'  => 0, // 超时时间（单位：毫秒）
        'prefix'   => '',
        'username' => '', //账号
        'password' => '', //密码
        'option'   => [],
    ];

    /**
     * 构造函数
     * @param array $options 缓存参数
     * @access public
     */
    public function __construct($options = [])
    {
        if (!extension_loaded('memcached')) {
            throw new \BadFunctionCallException('not support: memcached');
        }
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }
        $this->handler = new \Memcached;
        if (!empty($this->options['option'])) {
            $this->handler->setOptions($this->options['option']);
        }
        // 设置连接超时时间（单位：毫秒）
        if ($this->options['timeout'] > 0) {
            $this->handler->setOption(\Memcached::OPT_CONNECT_TIMEOUT, $this->options['timeout']);
        }
        // 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
        $servers = [];
        foreach ((array) $hosts as $i => $host) {
            $servers[] = [$host, (isset($ports[$i]) ? $ports[$i] : $ports[0]), 1];
        }