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run code in 150+ php & hhvm versions
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<?php $a = 0; $b = null; var_dump($a, $b); var_dump(isset($a), isset($b)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) NULL bool(true) bool(false)