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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('a'=>'b'); $b = array('a'=>'c'); $c = array_merge($a, $b); print_r($c);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [a] => c )
Output for hhvm-3.10.0

Process exited with code 153.