HDEL command in Redis is used when you need to delete one or more fields from a hash stored at a key. It's often used in situations where you have structured data represented as a Hash in Redis and you want to remove specific fields from the Hash.
Here is an example of using the
HDEL command in PHP:
In this code, we first connect to the Redis server and then set two fields ('name' and 'email') in the hash identified by the key 'user:1'. We then use the
hDel method to delete the 'email' field from the hash.
If you need to delete multiple fields at once, you can pass an array of field names:
This time, we are setting three fields in the hash and then deleting two of them using the
hDel method with an array argument.
HDELcommand on a key that holds a non-hash value. This will result in an error.
Q: What happens if I use
HDEL on a field which does not exist in the hash?
A: Redis will consider it a successful operation and return 0 indicating that no fields were removed.