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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,3); $b = array(4,5,6); $c = $a+$b; var_dump($c); ?>
Output for 4.3.0 - 7.1.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }