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run code in 150+ php & hhvm versions
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<?php $a = array(1, 2, 5); $b = array(4); $c = array(9, 10, 18); var_dump($a + $b);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(5) }