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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = new StdClass; $b = null; var_dump(!$a); var_dump(!$b instanceof StdClass); var_dump(!$a instanceof StdClass); var_dump(!($b instanceof StdClass)); var_dump(!($a instanceof StdClass)); var_dump($b instanceof StdClass); var_dump($a instanceof StdClass);
based on b0vYE
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(false) bool(true) bool(false) bool(true) bool(false) bool(false) bool(true)