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run code in 200+ php & hhvm versions
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<?php $a = (object)['active' => false]; $b = isset($a->active); var_dump($b);
based on u9XLv
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
bool(true)