first or fail laravel code example

Example 1: laravel findorfail

$model = App\Flight::where('name', 'Mike')->firstOrFail();

Example 2: find or fail laravel

$model = App\Models\Flight::findOrFail(1);

$model = App\Models\Flight::where('legs', '>', 100)->firstOrFail();

Example 3: eloquent first

$user = User::where('mobile', Input::get('mobile'))->get();

if (!$user->isEmpty()){
    $firstUser = $user->first()
}