## chunkWhile 方法根据指定的回调值把集合分解成多个更小的集合： ``` $collection = collect(str_split('AABBCCCD')); $chunks = $collection->chunkWhile(function ($current, $key, $chunk) { return $current === $chunk->last(); }); $chunks->all(); // [['A', 'A'], ['B', 'B'], ['C', 'C', 'C'], ['D']] ```