# Redis使用
### 使用Redis缓存
~~~
Cache::store('redis')->set('name','value',3600);
Cache::get('name');
~~~
#### 其他用法
~~~
Cache::store('redis')->set('name',time(),3600);
Cache::remember('name',time(),0);
Cache::rm('name');
Cache::clear('name');
Cache::inc('name',1);
Cache::dec('name');
$name = Cache::get('name');
var_dump($name);
~~~
**Redis.php**
> \thinkphp\library\think\cache\driver
>
~~~
<?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;
/**
* Redis缓存驱动，适合单机部署、有前端代理实现高可用的场景，性能最好
* 有需要在业务层实现读写分离、或者使用RedisCluster的需求，请使用Redisd驱动
*
* 要求安装phpredis扩展：https://github.com/nicolasff/phpredis
* @author 尘缘 <130775@qq.com>
*/
class Redis extends Driver
{
protected $options = [
'host' => '127.0.0.1',
'port' => 6379,
'password' => '',
'select' => 0,
'timeout' => 0,
'expire' => 0,
'persistent' => false,
'prefix' => '',
'serialize' => true,
];
/**
* 架构函数
* @access public
* @param array $options 缓存参数
*/
public function __construct($options = [])
{
if (!extension_loaded('redis')) {
throw new \BadFunctionCallException('not support: redis');
}
if (!empty($options)) {
$this->options = array_merge($this->options, $options);
}
$this->handler = new \Redis;
if ($this->options['persistent']) {
$this->handler->pconnect($this->options['host'], $this->options['port'], $this->options['timeout'], 'persistent_id_' . $this->options['select']);
} else {
$this->handler->connect($this->options['host'], $this->options['port'], $this->options['timeout']);
}
if ('' != $this->options['password']) {
$this->handler->auth($this->options['password']);
}
if (0 != $this->options['select']) {
$this->handler->select($this->options['select']);
}
}
/**
* 判断缓存
* @access public
* @param string $name 缓存变量名
* @return bool
*/
public function has($name)
{
return $this->handler->exists($this->getCacheKey($name));
}
/**
* 读取缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $default 默认值
* @return mixed
*/
public function get($name, $default = false)
{
$this->readTimes++;
$value = $this->handler->get($this->getCacheKey($name));
if (is_null($value) || false === $value) {
return $default;
}
return $this->unserialize($value);
}
/**
* 写入缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $value 存储数据
* @param integer|\DateTime $expire 有效时间（秒）
* @return boolean
*/
public function set($name, $value, $expire = null)
{
$this->writeTimes++;
if (is_null($expire)) {
$expire = $this->options['expire'];
}
if ($this->tag && !$this->has($name)) {
$first = true;
}
$key = $this->getCacheKey($name);
$expire = $this->getExpireTime($expire);
$value = $this->serialize($value);
if ($expire) {
$result = $this->handler->setex($key, $expire, $value);
} else {
$result = $this->handler->set($key, $value);
}
isset($first) && $this->setTagItem($key);
return $result;
}
/**
* 自增缓存（针对数值缓存）
* @access public
* @param string $name 缓存变量名
* @param int $step 步长
* @return false|int
*/
public function inc($name, $step = 1)
{
$this->writeTimes++;
$key = $this->getCacheKey($name);
return $this->handler->incrby($key, $step);
}
/**
* 自减缓存（针对数值缓存）
* @access public
* @param string $name 缓存变量名
* @param int $step 步长
* @return false|int
*/
public function dec($name, $step = 1)
{
$this->writeTimes++;
$key = $this->getCacheKey($name);
return $this->handler->decrby($key, $step);
}
/**
* 删除缓存
* @access public
* @param string $name 缓存变量名
* @return boolean
*/
public function rm($name)
{
$this->writeTimes++;
return $this->handler->delete($this->getCacheKey($name));
}
/**
* 清除缓存
* @access public
* @param string $tag 标签名
* @return boolean
*/
public function clear($tag = null)
{
if ($tag) {
// 指定标签清除
$keys = $this->getTagItem($tag);
foreach ($keys as $key) {
$this->handler->delete($key);
}
$this->rm('tag_' . md5($tag));
return true;
}
$this->writeTimes++;
return $this->handler->flushDB();
}
/**
* 如果不存在则写入缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $value 存储数据
* @param int $expire 有效时间 0为永久
* @return mixed
*/
public function remember($name, $value, $expire = null)
{
if (is_null($expire)) {
$expire = $this->options['expire'];
}
// 没有过期参数时，使用setnx
if (!$expire) {
$key = $this->getCacheKey($name);
$val = $this->serialize($value);
$res = $this->handler->setnx($key, $val);
if ($res) {
$this->writeTimes++;
return $value;
} else {
return $this->get($name);
}
}
if ($this->has($name)) {
return $this->get($name);
} else {
$this->set($name, $value, $expire);
}
return $value;
}
}
~~~
