Как сравнить 2 неодинаковых объекта или массива Yii2?

array(3) { 
[0]=> array(1) { 
[0]=> array(2) { 
        ["id"]=> string(1) "2" 
        ["username"]=> string(4) "ivan" } } 
[1]=> array(1) { [0]=> array(2) { 
       ["id"]=> string(1) "3" 
      ["username"]=> string(8) "Саша" } } 
[2]=> array(1) { [0]=> array(2) { 
        ["id"]=> string(2) "19" 
        ["username"]=> string(8) "Макс" } } }

array(2) { 
[0]=> array(1) { [0]=> array(2) { 
          ["id"]=> string(1) "1" 
          ["username"]=> string(5) "maxim" } } 
[1]=> array(1) { [0]=> array(2) { 
          ["id"]=> string(2) "19" 
          ["username"]=> string(8) "Макс" } } }

array(2) { [0]=> array(1) { [0]=> array(2) { 
          ["id"]=> string(1) "1" 
          ["username"]=> string(5) "maxim" } } 
[1]=> array(1) { [0]=> array(2) { <b>
         ["id"]=> string(2) "19" 
         ["username"]=> string(8) "Макс", 
         ['friend']=>1</b>} } }

$users = User::find()
    ->indexBy('id')
    ->all();

$friends = Friend::find()
    ->indexBy('id')
    ->all();

$result = array_intersect_key($users, $friends);