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run code in 200+ php & hhvm versions
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<?php $array1 = []; $array2 = [0 => '2']; $array3 = [0 => '2']; array_push($array1, ...$array2); array_push($array1, ...$array3); print_r($array1);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
Array ( [0] => 2 [1] => 2 )