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run code in 200+ php & hhvm versions
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<?php $a = ['a' => NULL]; var_dump(isset($a['a']));
based on mNf2l
Output for 5.6.0 - 5.6.38, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.11
bool(false)