isset in laravel controller code example

Example 1: isset laravel

//In Controller
public function returnView() {
    return View::make('view')->with('param',$param);
}

//In View
@isset($param)

Example 2: how to select specific id in laravel using isset

$data = fetchRecordFromStorage($storage, $identifier);
if (!isset($data['keyShouldBeSet']) {
    // do something here if 'keyShouldBeSet' is not set
}