JD> isset checks to see if the $a variable has
JD> been set, ie, if it exists. if($a) checks for
JD> the truthood of $a, meaning, if it has a
JD> non-zero, non-null/empty-string value, then
JD> its true, else, false.

... and if it's not set at all it returns a
warning unless you use "@" :(

Andrew Perevodchik

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