php中redis怎么使用,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

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;

}

public function __call($func, $params) {

if ($func == 'multi') {

$this->_return_data = $this->_red->multi($params[0]);

} else {

$this->_return_data = call_user_func_array(array(&$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;

}

}

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/