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> I disagree with (A).

Since you quite clearly have no idea what function we're even talking about or what it's supposed to do, I will just point you to the documentation rather than more explicitly explain on how many levels you are wrong: http://www.php.net/manual/en/function.number-format.php

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Pointing to the documentation does not work in this case. The documentation shows the user was not sticking to the function specs, yes, but neither does PHP most of the time. If PHP were a consistent (serious) language, I might see your point. It's not: it generally aims for leniency and minimum (well, small) surprise but doesn't seem to be doing it this time. I think you should make your argument clear.

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