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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('a','b'); if(array_key_exists('a',$a)){ echo 'true'; } if(!array_key_exists('c',$a)){echo 'false';}
Output for 4.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0RC5
false
Output for hhvm-3.10.0

Process exited with code 153.