仅从PHP关联数组中获取特定值

Question

我从一个Eloquent查询中得到一个Laravel集合，我使用toArray()方法转换成一个数组。示例输出如下所示。

Array ( [0] => Array ( [id] => 1 [details] => routes [level] => beginner [created_at] => 2022-11-16T11:09:48.000000Z [updated_at] => 2022-11-09T11:09:48.000000Z [pivot] => Array ( [user_id] => 1 [milestone_id] => 1 ) ) [1] => Array ( [id] => 2 [details] => router 2 [level] => beginner [created_at] => 2022-11-09T11:09:48.000000Z [updated_at] => 2022-11-18T11:09:48.000000Z [pivot] => Array ( [user_id] => 1 [milestone_id] => 2 ) ) [2] => Array ( [id] => 3 [details] => route [level] => route 3 [created_at] => 2022-11-15T09:05:46.000000Z [updated_at] => 2022-11-17T09:05:46.000000Z [pivot] => Array ( [user_id] => 1 [milestone_id] => 3 ) ) ) 1

我只需要pivot索引中milestone_ids的值。例如[1,2,3]

我尝试了不同的PHP方法和符号来访问这些值，但都没有成功。

Answer 1

可以使用

$milestoneIds = $collection->pluck('pivot.milestone_id')->toArray();

Answer 2

您可以通过数组

foreach或array_map

$milestone_ids = array_map(function($data){
return $data['pivot']['milestone_id'];
}, $pivot);

另一种方法是使用循环遍历数组中的每个数据集，并获得您要查找的值，并将其放入另一个数组中。

https://www.mycompiler.io/view/7jWliNt2Vo0