Basically it tells a savvy programmer whether or not his logic has
caused the var in question to "exist". Many times it is important
simply to know that, not what the var contains, which can lead to an
error in processing.
The isset() will tell you that "yes, I have this variable", letting you
then correctly interpret the contents. If a $_POST var is not set
(meaning the user made no input to it), the use of empty() will insist
on telling you that the var is empty even tho it really was not provided
by the user (assuming that you don't get an error msg for having an
invalid index in the POST array).
They seem to be needlessly redundant, but in fact do provide knowledge
for those seeking it.
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