if data not exist() in database laravel code example

Example 1: if notexists in laravel query

if (User::where('email', '=', Input::get('email'))->exists()) {
   // user found
}

Example 2: check for an existing user laravel eloquent

$users = User::where('email', '=', $request->input('email'))->first();
if ($users === null) {
  // User does not exist
} else {
  // User exits
}