Answers for "laravel check if request input exists"

laravel check if request has value

@if (request('category'))
    <input type="hidden" name="category" value="{{ request('category') }}">
@endif

laravel form request exists

public function rules(): array
{
   return [
       'ticket_category_id' => 'required|integer|exists:ticket_categories,id',
       'department_id' => 'required|integer|exists:departments,id'
    ];
}