I'm gonna decline the next time someone asks me "hop in chat with them" to discuss their stackoverflow problem.

I'd already given my two cents about the problem in question and I thought something was unclear about that so I say okay what the hell, made a chat room and invited him in.

Him: So I have this OTHER problem with [insert JS plugin]
Me: ... I don't know enough about it. I've used that specific plugin maybe once. The question I offered you my help with was PHP.
Him: Yeah but can you take a look really quick?
Me: I'd have to reread the documentation. I literally don't remember how to use it.
Him: No problem, here's the documentation. I want to do X, Y and Z.
Me: I don't think you can X without doing A and B first.
Him: I was told not to do A, so how can I do X, Y and Z?

Fucking hell I'm not gonna do your job for you. You know english. There is documentation available. Just read it and at least try things.