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$x = 0; $y = ''; if (isset($x, $y)) { echo "\$x and \$y are set.\n"; } else { echo "\$x or \$y is not set.\n"; // Never executed } unset($x, $y); if (isset($x, $y)) { echo "\$x and \$y are set.\n"; // Never executed } else { echo "\$x or \$y is not set.\n"; }