Laravel 8 flatten() {#collection-method}

2021-07-19 09:37 更新

flatten 方法將多維集合轉(zhuǎn)為一維集合：

$collection = collect(['name' => 'taylor', 'languages' => ['php', 'javascript']]);

$flattened = $collection->flatten();

$flattened->all();

// ['taylor', 'php', 'javascript'];

你可以選擇性地傳入「深度」參數(shù)：

$collection = collect([
    'Apple' => [
        ['name' => 'iPhone 6S', 'brand' => 'Apple'],
    ],
    'Samsung' => [
        ['name' => 'Galaxy S7', 'brand' => 'Samsung'],
    ],
]);

$products = $collection->flatten(1);

$products->values()->all();

/*
    [
        ['name' => 'iPhone 6S', 'brand' => 'Apple'],
        ['name' => 'Galaxy S7', 'brand' => 'Samsung'],
    ]
*/

在這個(gè)例子里，調(diào)用 flatten 時(shí)不傳入深度參數(shù)的話也會(huì)將嵌套數(shù)組轉(zhuǎn)成一維的，然后返回 ['iPhone 6S', 'Apple', 'Galaxy S7', 'Samsung'] 。傳入深度參數(shù)能讓你限制設(shè)置返回?cái)?shù)組的層數(shù)。

以上內(nèi)容是否對(duì)您有幫助：

← Laravel 8 flatMap() {#collection-method}

Laravel 8 flip() {#collection-method} →

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