Returns the string length of the value associated with field in the hash stored at key. If the key or the field do not exist, 0 is returned.
*Return value
Integer reply: the string length of the value associated with field, or zero when field is not present in the hash or key does not exist at all.
*Examples
redis>
HMSET myhash f1 HelloWorld f2 99 f3 -256
OKredis> HSTRLEN myhash f1
(integer) 10redis> HSTRLEN myhash f2
(integer) 2redis> HSTRLEN myhash f3
(integer) 4