core/library/think/Cache.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;

use think\cache\Driver;

class Cache
{
    /**
     * @var array 缓存的实例
     */
    public static $instance = [];

    /**
     * @var int 缓存读取次数
     */
    public static $readTimes = 0;

    /**
     * @var int 缓存写入次数
     */
    public static $writeTimes = 0;

    /**
     * @var object 操作句柄
     */
    public static $handler;

    /**
     * 连接缓存驱动
     * @access public
     * @param  array       $options 配置数组
     * @param  bool|string $name    缓存连接标识 true 强制重新连接
     * @return Driver
     */
    public static function connect(array $options = [], $name = false)
    {
        $type = !empty($options['type']) ? $options['type'] : 'File';

        if (false === $name) {
            $name = md5(serialize($options));
        }

        if (true === $name || !isset(self::$instance[$name])) {
            $class = false === strpos($type, '\\') ?
            '\\think\\cache\\driver\\' . ucwords($type) :
            $type;

            // 记录初始化信息
            App::$debug && Log::record('[ CACHE ] INIT ' . $type, 'info');