将集合中的值相乘

Question

大家好，我有这样的东西，我想乘以每个对象的 "number"。例如 2（第一个对象编号）x3（第二个对象编号）=6（答案应该是 6）有人知道怎么做吗？该数组并不总是 same.here 它有 2 个对象，但可以更改。

[{"id":7,"date":"2020-03-14","number":2},{"id":20,"date":"2020-03-15","number":3}]

更新答案（有效）

                     foreach ($studentDetail as $student){
                     $number = calendar::where('student_id','=',$student['id'])
                            ->where('date','>=',$jsonData->checkin)
                            ->where('date','<',$jsonData->checkout)
                            ->get();
                        Log::info($number );
                        $multiplied= $number ->reduce(function ($carry, $item) {
                             return $carry * $item->number;
                        }, 1);
                        Log::info($multiplied);
                        }

Answer 1

您可以使用Laravel collection

的reduce()方法

The reduce method reduces the collection to a single value, passing the result of each iteration into the subsequent iteration

$multiplied= $collection->reduce(function ($carry, $item) {
  return $carry * $item->number;
}, 1);

将集合中的值相乘

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