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run code in 200+ php & hhvm versions
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<?php $a = array(1,2); $b = array(); $r = array_merge($a,$b); var_dump($r);
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0
array(2) { [0]=> int(1) [1]=> int(2) }