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run code in 200+ php & hhvm versions
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<?php $arr = [ [0], [1], [2] ]; var_dump(array_merge(...$arr));
based on 64eJq
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) }