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run code in 150+ php & hhvm versions
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<?php $x = array('b'=>2); $y = array('a'=>1, 'b'=>3); var_dump($x + $y);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(2) { ["b"]=> int(2) ["a"]=> int(1) }