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run code in 200+ php & hhvm versions
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<?php $data = array(array(1, 2, 'last'), array(3, 4, 'last')); $result = array(); foreach ($data as $arr) foreach ($arr as $val) $result[] = $val; print_r($result);
Output for 4.3.0 - 7.2.0
Array ( [0] => 1 [1] => 2 [2] => last [3] => 3 [4] => 4 [5] => last )