任意键上的 Laravel `array_pluck`
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Laravel `array_pluck` on any key
提问by David Rodrigues
Is possible use something like array_pluck($array, 'users.*.id')?
可以使用类似的东西array_pluck($array, 'users.*.id')吗？
Imagine that I have:
想象一下，我有：
$array = [
'users' => [
[ 'id' => 1 ],
[ 'id' => 2 ],
[ 'id' => 3 ],
]
];
And I want get [1, 2, 3].
我想要得到[1, 2, 3]。
I tried something like: users.*.id, users.idand users..id, but nothing worked.
我尝试了类似的东西：users.*.id, users.idand users..id，但没有任何效果。
采纳答案by Ben Swinburne
Use array_pluck($array['users'], 'id')
用 array_pluck($array['users'], 'id')
The function only supports a single dimensional array. It will search for keys in the array which match the second parameter; which in your case is 'id'. You'll note that the array you're searching in your examples only has a key named usersand none with the name id.
该函数仅支持一维数组。它将在数组中搜索与第二个参数匹配的键；在你的情况下是'id'。您会注意到，您在示例中搜索的数组只有一个名为 的键，users而没有名为name的键id。
Using $array['users']means pluck looks through that array and subsequently finds keys named idon each element.
使用$array['users']mean pluck 查找该数组，然后找到id每个元素上命名的键。
回答by Basit
You can use Laravel collectionsto achieve something like this.
您可以使用Laravel 集合来实现类似的功能。
$data = collect($array['users']);
$ids = $data->pluck('id');
return $ids;
回答by Okipa
you should use https://laravel.com/docs/5.7/helpers#method-array-pluck.
Don't recreate helpers that already exist ;)
你应该使用https://laravel.com/docs/5.7/helpers#method-array-pluck。
不要重新创建已经存在的助手；)
