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run code in 200+ php & hhvm versions
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<?php $test = ['a', 'b','c']; $blah = ['c', 'd']; $a = array_merge($test, $blah); var_dump($a);
based on rNhqs
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "c" [4]=> string(1) "d" }