How to create name value pair array in yii2 - arrays

Question

i am trying to create an Array in yii2 in following format
[
['id'=>'2', 'name'=>'ABC'],
['id'=>'3', 'name'=>'DEF']
]
So far i have tried to use ArrayHelper class but if i map using it than it removes the key part from the array,i need to create the array in exact this format
$data = User::find()
->where(['id' => $id])
->orderBy('id DESC')
->all();
As you know after this code i get the data in ActiveRecord format so i need to convert them to id and name array only,i dont need any other data.
I tried doing this
$data2 = ArrayHelper::map($data, 'id', 'name');
But returns the data in following format
[
['2'=>'ABC'],
['3'=>'DEF']
]
I have tried this as well
$data = MainCategory::find()->select('id,name')
->where(['id' => $id])
->orderBy('id DESC')
->asArray()->all();
But its returning the array in following format
[
'0' =>
[
'id'=>'2',
'name'=>'ABC'
],
'1' =>
[
'id'=>'3',
'name'=>'DEF'
]
]
How can i achive key and value format in yii2?

Answer 1

You can fetch data as array like this:
$data = User::find()
->select('id, name')
->where(['id' => $id])
->orderBy('id DESC')
->asArray()
->all();

Answer 2

To create plain KEY => VALUE array use column() method:
$data = User::find()
->select(['name', 'id'])
->where(['id' => $id])
->orderBy('id DESC')
->asArray()
->indexBy('id')
->column();
First selected column [name] will be returned as a VALUE.