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> In ArangoDB, a transaction is always a server-side operation, and is executed on the server in one go, without any client interaction.

It doesn't seem to support interactive transaction. That means only simple batch read & write, no complex transaction. It seems in between CAS and real generic transaction. Doesn't seem to be much useful.

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No - it goes way beyond simple batches of operations. Basically you have to write your transaction as JavaScript program. So, you can do anything you could do on the client-side - with the exception of waiting for another source (i. e. user interaction). You could read a document from one collection, chose different actions based on the attribute. Change documents in multiple collections. I think the PHP driver uses some kind of abstraction to hide the JavaScript from the developer.

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