如何在Collection对象的每个方法内部的数组中添加值

Question

我使用的是Laravel5.4。

我想在Collection对象的每个方法内的数组中添加值。

这应该简单易行，但不起作用。

以下代码是我工作代码的简化版本。

请帮助我！

#Fode A

class ReportController extends Controller
{


    public function daily(ReportRequest $request) {

        $collection = VisitRecord::whereDate('visited_at', '=', Carbon::today())->get();

        $bounceZoneList = [];

        $collection->groupBy("bounce_zone")->each(function($group, $key) {

            echo "this line is called.";

            //add value to the array!
            $bounceZoneList[] = 1;

        });

        //but it doesn't have any value!
        var_dump($bounceZoneList); // array(0) { }

        }

}

模式B

class ReportController extends Controller
{


    public function daily(ReportRequest $request) {

        $collection = VisitRecord::whereDate('visited_at', '=', Carbon::today())->get();

        $bounceZoneList = [];

        $collection->groupBy("bounce_zone")->each(function($group, $key) use ($bounceZoneList) {

             echo "this line is called.";

            //add value to the array!
            $bounceZoneList[] = 1;

        });

        //but it doesn't have any value!
        var_dump($bounceZoneList); // array(0) { }

        }

}

怎么回事？

我该如何解决？

Answer 1

在* each *闭包中，首先返回键，因此subClientKoEligible
function($key,$group)作为集合返回，因此您可以循环遍历它
试试：

$group

Answer 2

class ReportController extends Controller
{


    public function daily(ReportRequest $request) {

        $collection = VisitRecord::whereDate('visited_at', '=', Carbon::today())->get();

        $bounceZoneList = [];

        $collection->groupBy("bounce_zone")->each(function($group, $key) use (&bounceZoneList) {

             echo "this line is called.";

            $bounceZoneList[] = 1;

        });

        var_dump($bounceZoneList); // array(0) { }

        }

}

NG - 使用（bounceZoneList）

确定 - 使用（＆amp; bounceZoneList）