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run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = &$row['test']; print_r($row);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.13.2, 7.0.0 - 7.1.7
Array ( [test] => )
Output for hhvm-3.15.4 - 3.17.3

Process exited with code 137.