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run code in 150+ php & hhvm versions
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<?php $a = array('a' => '1') + array('b' => '2'); print_r($a);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [a] => 1 [b] => 2 )