Improve code readability

[m-fedosov]

I've kept the same checks, but replaced or removed unnecessary instructions that can be confusing to a beginner

[m-fedosov]

Let's pull this one into master

[digininja]

You don't seem to be getting the online comments so I'll try again. I don't like echo compared to dropping out of php so I'd reject all of those. On high, you've lost a 500 response code. On impossible, can you do something other than ??, I don't think that improves readability.

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