// hset/hget 存取hash表的数据
~~~
$redis->hset('test:hash1', 'field1', 'v1');
$redis->hset('test:hash1', 'field2', 'v2');
$redis->hget('test:hash1', 'field1');
~~~
// 只有在字段 field 不存在时，设置哈希表字段的值
~~~
$redis->hsetnx('test:hash1', 'field1', 'v2');
$redis->hsetnx('test:hash1', 'field3', 'v3');
~~~
// hmset/hmget 存取多个元素
~~~
$redis->hmset('test:hash1', array('field3' => 'v3-2', 'field4' => 'v4'));
$redis->hmget('test:hash1', array('field3','field4'));
~~~
// hincrby 指定字段，设置整数增量
~~~
$redis->hincrby('test:hash1', 'field5', 3);
$redis->hincrby('test:hash1', 'field6', -10);
~~~
// hexists 查询特定哈希表中，指定field的元素是否存在
~~~
$redis->hexists('test:hash1', 'field1');
~~~
// hdel 删除hash表中指定field的元素
~~~
$redis->hdel('test:hash1', 'field2');
~~~
// hlen 返回hash表元素个数
~~~
$redis->hlen('test:hash1');
~~~
// hkeys 返回hash表中的所有key
~~~
$redis->hkeys('test:hash1');
~~~
// hvals 返回hash表中的所有value
~~~
$redis->hvals('test:hash1');
~~~
// hgetall 返回整个hash表元素
~~~
$redis->hgetall('test:hash1');
~~~
