我正在尝试添加这个功能称为预订为他人。如果用户要订购5旅游包，用户必须输入4电子邮件的用户朋友，通知他们，他们得到了旅游包由该用户。我的想法是存储电子邮件在数组中。当我试图创建前端我得到错误count(): Argument #1 ($value) must be of type Countable|array, null given。我如何存储数组值？
控制器：

public function store(Request $request){
        $numbers = $request->numbers;
        $emails = $request->email;
        for($count = 0; $count < count($numbers); $count++){
            emails::create([
                'email'=>$emails[$count]
            ]);
        }
        return redirect ('/home/');
    }

刀片文件：

<form action="{{route('EmailStore')}}" method="post">
    @csrf
    <div class="form-group">
        <label>How many people</label>
        <input type="text" required class="form-control @error ('numbers') is-invalid @enderror" 
        id="numbers" name="numbers" autocomplete="off">
    </div>
    @php
        $emails = count($numbers);
    @endphp
    @for ($i = 0; $i < $emails; $i++)
        <tr>
            <td>
                <label>Email.{{$i}}</label>
                <input type="text" required class="form-control @error ('email') is-invalid @enderror" 
                id="email" name="email[]" autocomplete="off">
            </td>
        </tr>
    @endfor
    <button type="submit" class="btn btn-info" id="btn_submit" 
        style="background-color: #eefa69; border:none; color:black">Submit</button>
</form>

例如输入是这样的：How many book : 5

Email number 1 : a@gmail.com
Email number 2 : b@gmail.com
Email number 3: c@gmail.com
Email number 4: d@gmail.com