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run code in 150+ php & hhvm versions
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<?php $tt = array("id"=> 'aaa'); $bb = array('cc'=> 'zzzz'); var_dump($tt+$bb);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { ["id"]=> string(3) "aaa" ["cc"]=> string(4) "zzzz" }
Output for hhvm-3.10.0

Process exited with code 153.