ThinkPHP+Redis 缓存类

本文适用 ThinkPHP 3.x 版本，更新版本的 TP 请查询 TP 官方文档，下文代码已经同步至 github

http://github.com/vus520/thinkphp

为了让ThinkPHP支持Redis，写了这个Redis的缓存类，里面只有简单的Get和Set方法，方便在S方法直接使用，复杂的使用方法，可以直接使用phpRedis。

本类要求支持phpRedis安装方法

http://www.4wei.cn/archives/1001521

在TP项目中的路径

ThinkPATH\Lib\Think\Util\Cache\CacheRedis.class.php

Extend\Driver\Cache\CacheRedis.class.php

配置方法，在ThinkPHP项目配置文件中，添加以下参数：

    /* 系统缓存 */
    'DATA_CACHE_TYPE'                   => 'Redis',
    'REDIS_HOST'                        => '192.168.0.243',
    'REDIS_PORT'                        => 6379,
    'DATA_CACHE_TIME'                   => 3600,

上述参数分别表示缓存类型，主机，端口和超时时间。

源码如下：

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 尘缘 <130775@qq.com>
// +----------------------------------------------------------------------
// $Id: CacheRedis.class.php 2728 2012-02-12 04:12:51Z liu21st $

/**
 +-------------------------------------
 * CacheRedis缓存驱动类
 * 要求安装phpredis扩展：https://github.com/owlient/phpredis
 +-------------------------------------
 */
class CacheRedis extends Cache {

    /**
     +----------------------------------------------------------
     * 架构函数
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */
    public function __construct($options='') {
        if ( !extension_loaded('redis') ) {
            throw_exception(L('_NOT_SUPPERT_').':redis');
        }
        if(empty($options)) {
            $options = array (
                'host'  => C('REDIS_HOST') ? C('REDIS_HOST') : '127.0.0.1',
                'port'  => C('REDIS_PORT') ? C('REDIS_PORT') : 6379,
                'timeout' => C('DATA_CACHE_TIMEOUT') ? C('DATA_CACHE_TIMEOUT') : false,
                'persistent' => false,
                'expire'   => C('DATA_CACHE_TIME'),
                'length'   => 0,
            );
        }
        $this->options =  $options;
        $func = $options['persistent'] ? 'pconnect' : 'connect';
        $this->handler  = new Redis;
        $this->connected = $options['timeout'] === false ?
            $this->handler->$func($options['host'], $options['port']) :
            $this->handler->$func($options['host'], $options['port'], $options['timeout']);
    }

    /**
     +----------------------------------------------------------
     * 是否连接
     +----------------------------------------------------------
     * @access private
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */
    private function isConnected() {
        return $this->connected;
    }

    /**
     +----------------------------------------------------------
     * 读取缓存
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $name 缓存变量名
     +----------------------------------------------------------
     * @return mixed
     +----------------------------------------------------------
     */
    public function get($name) {
        N('cache_read',1);
        return $this->handler->get($name);
    }

    /**
     +----------------------------------------------------------
     * 写入缓存
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $name 缓存变量名
     * @param mixed $value  存储数据
     * @param integer $expire  有效时间（秒）
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */
    public function set($name, $value, $expire = null) {
        N('cache_write',1);
        if(is_null($expire)) {
            $expire  =  $this->options['expire'];
        }
        if(is_int($expire)) {
            $result = $this->handler->setex($name, $expire, $value);
        }else{
            $result = $this->handler->set($name, $value);
        }
        if($result && $this->options['length']>0) {
            // 记录缓存队列
            $this->queue($name);
        }
        return $result;
    }

    /**
     +----------------------------------------------------------
     * 删除缓存
     *
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param string $name 缓存变量名
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */
    public function rm($name) {
        return $this->handler->delete($name);
    }

    /**
     +----------------------------------------------------------
     * 清除缓存
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @return boolen
     +----------------------------------------------------------
     */
    public function clear() {
        return $this->handler->flushDB();
    }
}