php - 如何将 php 数组索引设置为数组值...？

Question

我从查询中得到了这个数组。

Array
(
    [0] => Array
        (
            [user_id] => 5
            [first_name] => Diyaa
            [profile_pic] => profile/user5.png
        )

    [1] => Array
        (
            [user_id] => 8
            [first_name] => Raj
            [profile_pic] => profile/user8.jpg
        )

    [2] => Array
        (
            [user_id] => 10
            [first_name] => Vanathi
            [profile_pic] => profile/user10.jpg
        )
)

我需要将数组索引设置为数组值 (user_id)，如下所示:

Array
(
    [5] => Array
        (
            [user_id] => 5
            [first_name] => Diyaa
            [profile_pic] => profile/user5.png
        )

    [8] => Array
        (
            [user_id] => 8
            [first_name] => Raj
            [profile_pic] => profile/user8.jpg
        )

    [10] => Array
        (
            [user_id] => 10
            [first_name] => Vanathi
            [profile_pic] => profile/user10.jpg
        )
)

注意 user_id是一个唯一值，不会重复。无需担心索引值。

如何将数组转换为指定的索引值..？

Answer 1

这正是 array_column() 的用途:

$result = array_column($array, null, 'user_id');

array_column() returns the values from a single column of the input, identified by the column_key. Optionally, an index_key may be provided to index the values in the returned array by the values from the index_key column of the input array.

column_key

The column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or property name. It may also be NULL to return complete arrays or objects (this is useful together with index_key to reindex the array).