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<?php $test1 = null; $test2 = false; $test3 = true; var_dump(isset($test1)); var_dump(isset($test2)); var_dump(isset($test3));
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(true)