how can i check there is an variable laravel?

问题

i have this on my view im trying to pass $reservations when there is some reservations in DB there is no error but when it is empty i got error

Undefined variable: reservations (View: C:\Users\yass\Desktop\E-tourisme-44\E-tourisme-5554\resources\views\moderateur\reservation.blade.php)

Template

<tbody>
                        @if($reservations )

                        @foreach($reservations as $reservation)

                            <tr>      
                                <td> {{$reservation->children}} </td>
                                <td> {{$reservation->checkin}} </td>
                                <td> {{$reservation->checkout}} </td>
                                <td>

                        @endforeach
                       @else
                                    <div>
                                       No Data
                                    </div>
                            @endif

                        </tbody>

and this is my function

public function index()
{
    $myhotels = hotel::where('created_by', Auth::user()->id)->first();
    if ($myhotels) {
        $reservations = Reservation::where('hotel_id', $myhotels->id)->get();
        return view('moderateur/reservation', compact('reservations'));
    }
    return view('moderateur/reservation');
}

回答1:

Try with:

@if(isset($reservations))

回答2:

To make your code work, instead

@if($reservations )

use

@if(! empty($reservations))

Also instead combining @if with @foreach for displaying "no data" consider using @forelse @empty instead. Docs: https://laravel.com/docs/7.x/blade#loops

回答3:

You can use

@isset($reservations)
  //your code
@endisset

Or you can write your code like this

{{ $reservations ?? null }}

来源：https://stackoverflow.com/questions/62225494/how-can-i-check-there-is-an-variable-laravel