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run code in 150+ php & hhvm versions
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<?php $a=array('a'=>1); $b=array('b'=>2); var_dump($a+$b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["a"]=> int(1) ["b"]=> int(2) }