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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(1); //$b = NULL; if(!empty($a) && isset($a[$b]['pqr'])){ print 'in switch'; } else { print 'Empty'; }
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: b in /in/8jncY on line 4 Empty
Output for hhvm-3.12.0
Empty
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: b in /in/8jncY on line 4 Empty