In most situations, nodes will allow other nodes to be children, thus forming a parent-child relationship with each other.
It would be very useful to add this process as a standard within custom user fields.
By default, we need to control of parent/child custom user field.
However, there are...
(moved from a bug report)
If I have an add-on which uses a custom user field, how can I check whether the field exists?
array_key_exist does not really help, because it only checks the cache in this case.
Without this check the field is still considered valid even when the field was in fact...