我在 laravel 中插入多个复选框值.我怎样才能做到这一点

我想要插入多个复选框值和多个邮箱，我正在用Foreach循环来做这件事.一切正常，但当1封邮箱为空时.它在邮箱字段中插入NULL，并且NULL复选框也插入完整数据.

这是我的表格，有20个输入

 <form method="POST" action="{{route('send.document')}}">
    @csrf 
   // 1st Email
    <input type="email"  name="email[]">
    <input type="checkbox" name="task[]" value="sign">
    <input type="checkbox" name="task[]" value="initial">
    <input type="checkbox" name="task[]" value="date">
    <input type="checkbox"name="task[]"  value="cc">
    // 2nd Email
    <input type="email" name="email[]" >
    <input type="checkbox"name="task[]" value="sign">
    <input type="checkbox" name="task[]" value="initial">
    <input type="checkbox" name="task[]"value="date">
    <input type="checkbox" name="task[]" value="cc">
    // 3rd Email
    <input type="email" name="email[]">
    <input type="checkbox" name="task[]" value="sign">
    <input type="checkbox" name="task[]" value="initial">
    <input type="checkbox" name="task[]" value="date">
    <input type="checkbox" name="task[]" value="cc">
    // 4th Email
    <input type="email" name="email[]" >
    <input type="checkbox" name="task[]" value="sign">
    <input type="checkbox" name="task[]" value="initial">
    <input type="checkbox" name="task[]" value="date">
    <input type="checkbox" name="task[]" value="cc">
    <button type="submit">Send</button>
    </form>

这是我的路由

 Route::post('/send-document',[SendDocumentController::class, 'sendDocToUser'])- 
    >name('send.document');

我的控制器

public function sendDocToUser(Request $request)
        {
            $UpdateFile = FileStorage::where('id', $request->id)->first();
            if (!empty($request->email)) {
                foreach($request->email as $mail) {
                    $save = new SendFile([
                        'Email' => $mail,
                        'senderId' => Auth::id(),
                        'fileName'=> $UpdateFile->uniqueFileName,
                        'task' => $request->task,
                    ]);
                    $save->save();
                }
            }
    }

数据库插入的数据:

and the form look like: