In the php tag, we receive a lot of questions that are either too basic or lacks a minimal understanding of the problem being solved. See this question for example. For some of these questions, where none of the existing close-reasons apply, I can go with one of the following options:
Find a good question that (partially) answers the question and close it as a duplicate
Use a custom close-reason: "Questions asking for code must demonstrate a minimal understanding of the problem being solved."
Close the question as off-topic with the following reason: "This question appears to be off-topic because it lacks sufficient information to diagnose the problem."
Most of the times, the OP could solve have their problem just by googling for the keywords. But for some questions, it is hard to find a relevant duplicate question that answers the question (at least, partially). Even if you find a question with an acceptable answer, it's often "too localized".
This close-reason was removed because it was abused. With the custom-reason, you're still closing the question with the same close-reason. I'm not too sure if this is a good idea.
The question is definitely answerable (and is often answered). It is written well and it's clear what the OP's trying to accomplish - but the question is too basic and has been previously answered. I feel this is more suitable for a specific subset of "unclear what you're asking" questions. I don't think this one fits either.
What's the best way to close questions that are "too-basic", or lacks the minimal understanding of the problem being solved?