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$a = "test"; $b = "anothertest"; echo isset ($a); / / true echo isset ($a, $b) / /true unset ($a); echo isset ($a); / / false echo isset ($a, $b); / /false $foo = null; print isset ($foo); / / false
echo isset ($a); / / false $a = "test"; echo isset ($a); / / true unset ($a); echo isset ($a); / / false