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.
Examples
Return information
Integer reply: the string length of the value associated with the field, or zero when the field isn't present in the hash or the key doesn't exist at all.
Integer reply: the string length of the value associated with the field, or zero when the field isn't present in the hash or the key doesn't exist at all.