What is the difference between a documented function and a single argument list?

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I was giving a read through the PHP documentation and came across this note when I was going through the function str_getcsv

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And I was left with the question of what difference that would imply, someone willing to explain or say where would be the best source to seek that information?

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The difference is that a documented function has all the information you need to use it. For example: necessary arguments, what the function returns, examples of how to use the function, possible errors, etc. And the list of arguments only has the necessary arguments to use in the function.

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