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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = NULL; var_dump($a == NULL,is_null($a)); var_dump($a != NULL, isset($a)); var_dump(isset($somevar));
Output for 4.3.0 - 7.2.0
bool(true) bool(true) bool(false) bool(false) bool(false)