<?php $arr1 = [1, 2, 3, 7, 8, 9]; $arr2 = [4, 5, 6, 10, 11, 12, 13, 14]; $result = []; while ($arr1 || $arr2) { array_push($result, ...array_splice($arr1, 0, 3), ...array_splice($arr2, 0, 3)); } var_export($result);
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