### **1.String 字符串**
* 最常见的数据类型
* 可以为任何类型的字符串，比如二进制，json对象
* 最大容量512M
### **2.常见操作**
1. 赋值
`$redis->set('key','value');`
2. 赋值并添加过期时间
`$redis->setex('key','expire','value');`
3. 取值
`$redis->get('key');`
4. 递增数字
`$redis->incr('int_key');`
5. 增加指定的数字
`$redis->incrBy('int_key','number');`
6. 递减数字
`$redis->decr('key1');`
7. 减少指定的数字
`$redis->descBy('key1','number');`
8. 增加指定浮点数
`$redis->incrByFloat('key1',1.5);`
9. 向尾部追加值
`$redis->append('key','value2');`
10. 获取字符串长度
`$redis->strlen('key');`
11. 同时设置多个key的值
`$redis->mSet(array('key0' => 'value0','key1' => 'value1'));`
12. 同时获取多个key的值
`$redis->mGet(array('key0','key1'));`
### **3.封装自己的Redis类**
#### 1.编写 Redis 类
```
class Redis
{
private static $write_handle = null;
private static $read_handle = null;
/**初始化
* @return Redis|null
*/
public static function getWrite()
{
$option = array(
'host' => Config::get('cache.REDIS_W_HOST', '127.0.0.1'),
'port' => Config::get('cache.REDIS_W_PORT', '6379'),
'auth' => Config::get('cache.REDIS_W_PASSWORD', '')
);
if (!self::$write_handle) {
self::$write_handle = new \Redis();
self::$write_handle->connect($option['host'], $option['port']);
self::$write_handle->auth($option['auth']);
}
return self::$write_handle;
}
public static function getRead()
{
$option = array(
'host' => Config::get('cache.REDIS_R_HOST', '127.0.0.1'),
'port' => Config::get('cache.REDIS_R_PORT', '6379'),
'auth' => Config::get('cache.REDIS_R_PASSWORD', '')
);
if (!self::$read_handle) {
self::$read_handle = new \Redis();
self::$read_handle->connect($option['host'], $option['port']);
self::$read_handle->auth($option['auth']);
}
return self::$read_handle;
}
/**
* 存储
* @param $key
* @param $value
* @param int $expire
*/
public static function set($key, $value, $expire = 0)
{
if (!self::getWrite()) {
return false;
}
if ($expire == 0) {
return self::getWrite()->set($key, $value);
} else {
return self::getWrite()->setex($key, $expire, $value);
}
}
/**
* 获取
* @param $key
* @return mixed
*/
public static function get($key)
{
$func = is_array($key) ? 'mget' : 'get';
return self::getRead()->{$func}($key);
}
/**自增
* @param $key
* @param int $number
* @return false|int
*/
public static function incr($key, $number = 1)
{
if (!self::getWrite()) {
return false;
}
if ($number == 1) {
return self::getWrite()->incr($key);
} else {
return self::getWrite()->incrBy($key, $number);
}
}
/**获取长度
* @param $key
* @return int
*/
public static function strlen($key)
{
return self::getRead()->strlen();
}
}
```
#### 2.调用
```
\Driver\Cache\Redis::set('user','李四',600);
echo \Driver\Cache\Redis::get('user');
```
### **5.Zset 可排序集合**
