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<?php $arr1 = [1, 2, 3, 7, 8, 9]; $arr2 = [4, 5, 6, 10, 11, 12, 13, 14]; $result = []; for ($i = 0; isset($arr1[$i]) || isset($arr2[$i]); $i += 3) { array_push($result, ...array_slice($arr1, $i, 3), ...array_slice($arr2, $i, 3)); } var_export($result); echo "\n"; var_export($arr1); echo "\n"; var_export($arr2);