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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = null; var_dump($a); var_dump(isset($a));
based on KBhk3
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
NULL bool(false)