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run code in 200+ php & hhvm versions
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<?php $x = ['USD', 'GBP']; $y = ['USED']; var_dump(array_merge($x, $y));
based on eqL0l
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0alpha1
array(3) { [0]=> string(3) "USD" [1]=> string(3) "GBP" [2]=> string(4) "USED" }