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run code in 150+ php & hhvm versions
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<?php $a1 = array(1,2,3,4); $a1 += array(5,6,7); var_dump($a1);
Output for 4.3.0 - 7.1.0
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) }