## pluck方法 获取集合中给定键对应的所有值 获取集合中给定**键**对应的所有值。 ~~~ $collection = collect([ ['product_id' => 'prod-100', 'name' => 'Desk'], ['product_id' => 'prod-200', 'name' => 'Chair'], ]); $plucked = $collection->pluck('name'); $plucked->all(); // ['Desk', 'Chair'] ~~~ 也可以通过传入第二个参数来指定生成的集合的键： ~~~ $plucked = $collection->pluck('name', 'product_id'); $plucked->all(); // ['prod-100' => 'Desk', 'prod-200' => 'Chair'] ~~~