如何在 Phalcon 中以简单数组的形式检索表中的主键？

Question

I have a table called users with primary key on usr_id . I want to retrieve all usr_id from the table as an arry.

I tried

$alluserid= $user->find(array(
   "columns" => "usr_id"
))->toArray();

How can I change $targetId into a simple array like Array(1,2,3,4) instead of

Array( 
[0] => Array
    (
        [usr_id] => 37
    )

[1] => Array
    (
        [usr_id] => 36
    )
)

Answer 1

$alluserid= $user->find(array(
   "columns" => "usr_id"
))->toArray();

var_dump(array_column($alluserid, 'usr_id'));