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run code in 150+ php & hhvm versions
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<?php $a = array(1, 2); $b = array(3,4,5); print_r($a + $b); print_r(array_merge($a, $b));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 5 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )