Command or function that updates asset custom key value

Question

I am writing an application, and I need to query and update the value of an asset's custom key fields. I am using the Multichain-API-PHP. I have the queries working. However, updating the value of the asset's custom fields is not working.

Is there command or function that updates asset custom key values?

Comments

How are you trying to update the asset's custom fields? Generally speaking if you want to have updating data, you should consider using a stream or a variable.