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                # flatMap方法 遍歷集合并將其中的每個值傳遞到給定的回調。 可以通過回調修改每個值的內容再返回出來,從而形成一個新的被修改過內容的集合。 然后就可以用[all()](http://www.hmoore.net/collections/all.md)打印修改后的數組。 - 【與map區別】 - 1、map是可以修改集合中的任意修改項目的值并返回 - 2、flatMap是修改集合中的每個項目的值并返回 ~~~ $collection = collect([ ['name' => 'Sally'], ['school' => 'Arkansas'], ['age' => 28] ]); $flattened = $collection->flatMap(function ($values) { return array_map('strtoupper', $values); }); $flattened->all(); // ['name' => 'SALLY', 'school' => 'ARKANSAS', 'age' => '28']; ~~~
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