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                ## transform方法 迭代集合并對集合內的每個項目調用給定的回調 與`map`相似,但`transform`會改變集合本身,而`map`不會 迭代集合并對集合內的每個項目調用給定的回調。而集合的內容也會被回調返回的值取代。 ~~~ $collection = collect([1, 2, 3, 4, 5]); $collection->transform(function ($item, $key) { return $item * 2; }); $collection->all(); // [2, 4, 6, 8, 10] ~~~ > 與大多數集合的方法不同,`transform`會修改集合本身。 > 如果你想創建新的集合,就改用[map](http://www.hmoore.net/collections/map.md)方法。
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