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run code in 200+ php & hhvm versions
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<?php $a = [0 => 'foo']; $b = [1 => 'bar']; var_dump($a + $b);
based on kWgXM
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }