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run code in 150+ php & hhvm versions
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<?php $a1 = array(1=>1,2=>2,3=>3,4=>4); $a1 += array(5=>5,6=>6,7=>7); var_dump($a1);
based on dMEnY
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(7) { [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) [6]=> int(6) [7]=> int(7) }