laravel 集合函数reduce的运用

原始数据

Collection {#1643 ▼
  #items: array:10 [▼
    1 => {#1677 ▼
      +"id": 1
      +"name": "测试"
    }
    2 => {#1673 ▼
      +"id": 2
      +"name": "格格寄存"
    }
    3 => {#1672 ▼
      +"id": 3
      +"name": "格格洗衣"
    }
    4 => {#1671 ▼
      +"id": 4
      +"name": "格格租借"
    }
    5 => {#1670 ▼
      +"id": 5
      +"name": "丰巢寄件"
    }
    6 => {#1669 ▼
      +"id": 6
      +"name": "裹裹寄件"
    }
    7 => {#1668 ▼
      +"id": 7
      +"name": "裹儿寄件"
    }
    8 => {#1667 ▼
      +"id": 8
      +"name": "格格快递员预定"
    }
    9 => {#1666 ▼
      +"id": 9
      +"name": "格格快递员租用"
    }
    10 => {#1665 ▼
      +"id": 10
      +"name": "圆通预约"
    }
  ]}

需要得到的数据

array:10 [▼
  1 => "测试"
  2 => "格格寄存"
  3 => "格格洗衣"
  4 => "格格租借"
  5 => "丰巢寄件"
  6 => "裹裹寄件"
  7 => "裹儿寄件"
  8 => "格格快递员预定"
  9 => "格格快递员租用"
  10 => "圆通预约"]

把二维数据转成一维数组

$new = collect($merchant_items)->reduce(function($res,$item){
return $res + [$item->id => $item->name];
},[]);