PHP中使用Redis

首先要确保有Redis的服务

# redis-cli -v
redis-cli 3.2.8

# redis-server -v
Redis server v=3.2.8 sha=00000000:0 malloc=jemalloc-4.0.3 bits=64 build=e034df79550b120

然后确保PHP已经添加了Redis扩展

# php -m |grep redis
redis

然后要创建Redis类

<?php

class Red {

    static private $redis = NULL;

    private $_red = NULL;

    private $_return_data = NULL;

    // 工厂加单例模式
    static public function create() {
        if(self::$redis) {
            return Red::$redis;   
        }        

        self::$redis = new self;
        return self::$redis;
    }   

    // 当调用的方法不存在会调用call方法,当方法不存在就去访问redis自身的方法
    public function __call($func, $params) {
        if ($func == 'multi') {
            $this->_return_data = $this->_red->multi($params[0]);

        } else {
            // 调用red对象下的方法，并传递参数
            $this->_return_data = call_user_func_array(array(&$this->_red, $func), $params);

        }   

        return $this->_return_data;
    }   

    private function __construct() {

        $this->_red = new Redis(); 
        $this->_red->connect(C("REDIS_HOST"),C("REDIS_PORT"));
        $this->_red->select(C('REDIS_DB') ?: 0);
        return Red::$redis;
    }   
}

<?php

class Red {

    static private $redis = NULL;

    private $_red = NULL;

    private $_return_data = NULL;

    static public function create() {
        if(self::$redis) {
            return Red::$redis;
        }

        self::$redis = new self;
        return self::$redis;
    }

    // 当调用的方法不存在会调用call方法,当方法不存在就去访问redis自身的方法
    public function __call($func, $params) {
        if ($func == 'multi') {
            $this->_return_data = $this->_red->multi($params[0]);

        } else {
            // 调用red对象下的方法，并传递参数
            $this->_return_data = call_user_func_array(array(&$this->_red, $func), $params);

        }
        return $this->_return_data;
    }

    private function __construct() {

        $this->_red = new Redis();
        $this->_red->connect(C("REDIS_HOST"),C("REDIS_PORT"));
        $this->_red->select(C('REDIS_DB') ?: 0);
        return Red::$redis;
    }

    public function ttl($key)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->ttl($new_key);
    }

    public function del($key)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->del($new_key);
    }

    public function delete($key)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->delete($new_key);
    }

    public function rename($key1, $key2)
    {
        $new_key1 = C('REDIS_PREV') . $key1;
        $new_key2 = C('REDIS_PREV') . $key2;
        return $this->_red->rename($new_key1, $new_key2);
    }

    public function exists($key)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->exists($new_key);
    }

    public function setex($key, $time ,$value)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->setex($new_key, $time, $value);
    }

    public function set($key, $value)
    {
        $new_key = C('REDIS_PREV') . $key;
        return $this->_red->set($new_key, $value);
    }

    public function get($key)
    {
        $new_key = C('REDIS_PREV') . $key;
        $a = $this->_red->get($new_key);
        return $a;
    }
}

config.php中配置Redis

'REDIS_HOST'                =>  '127.0.0.1',
'REDIS_PROT'                =>  6379,

使用Redis，可以提高查询速度，一些不变的查询，可以保存到Redis中，进行快速查询。比如查询城市信息，保存到Redis中，不必每次都查看数据库。

// 获取区域数据
public function get_map() {
        vendor('Redis.Red');
        $redis = Red::create();
        $data = $redis->get('china:area');
        if (!$data) {
            $areaModel = M('china_area');
            $p = $areaModel->field('id,name,level')->where(['level' => 1])->select();
            foreach ($p as $k => $v) {
                $c = $areaModel->field('id,name,level')->where(['level' => 2, 'upid' => $v['id']])->select();
                foreach ($c as $ck => $cv) {
                    $p[$k]['child'][$ck] = $cv;
                    $d = $areaModel->field('id,name,level')->where(['level' => 3, 'upid' => $cv['id']])->select();
                    foreach ($d as $dk => $dv) {
                        $p[$k]['child'][$ck]['child'][] = $dv;
                    }
                }
            }
            $redis->set('china:area', json_encode($p,JSON_UNESCAPED_UNICODE));
        } else {
            $p = json_decode($data, true);
        }

        $this->json->setAttr("data", $p);
        $this->json->Send();
}

第一次查询，用时

第二次查询，已经存入Redis

差距很明显吧！！！

Redis一个key或value值可以存储512M的数据，很强大了。

可以去redis中查看一下，

127.0.0.1:6379> keys china:area
1) "china:area"

Redis 可以存储任意类型的数据，最好通过json加密进去吧。获取的时候，进行解密。

查看PHP扩展文档，https://github.com/phpredis/phpredis/