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Laravel 8 keyBy() {#collection-method}
2021-07-19 09:40 更新
keyBy 方法以指定的键作为集合的键。如果多个元素具有相同的键，则只有最后一个元素会显示在新集合中：
$collection = collect([
['product_id' => 'prod-100', 'name' => 'Desk'],
['product_id' => 'prod-200', 'name' => 'Chair'],
]);
$keyed = $collection->keyBy('product_id');
$keyed->all();
/*
[
'prod-100' => ['product_id' => 'prod-100', 'name' => 'Desk'],
'prod-200' => ['product_id' => 'prod-200', 'name' => 'Chair'],
]
*/你还可以在这个方法传递一个回调函数。该回调函数返回的值会作为该集合的键：
$keyed = $collection->keyBy(function ($item) {
return strtoupper($item['product_id']);
});
$keyed->all();
/*
[
'PROD-100' => ['product_id' => 'prod-100', 'name' => 'Desk'],
'PROD-200' => ['product_id' => 'prod-200', 'name' => 'Chair'],
]
*/以上内容是否对您有帮助：
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