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run code in 150+ php & hhvm versions
Bugs & Features
<?php $month=9; $year=2014; $x=array(); if (array_key_exists('billing_type', $x)) { $out= $x['billing_type']; } else { $out= 'month'; } echo $out;
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
month
Output for hhvm-3.10.0

Process exited with code 153.