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run code in 150+ php & hhvm versions
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<?php $a = array(array(1)); $b = ''; if(!empty($a) && isset($b) && isset($a[$b]['pqr'])){ print 'in switch'; } else { print 'Empty'; }
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Empty
Output for hhvm-3.10.0

Process exited with code 153.