Laravel 5 input::get error - php

Question

Why am I having this error? I tried to add use Illuminate\Http\Request;
but same error? Also is $username = $request->input('username'); the same as $username = Input::get('username');?
The error I get is:
FatalErrorException in LoginController.php line 22: Class 'App\Http\Controllers\Input' not found
class LoginController extends Controller {
// Display the login form
public function showLogin()
{
return View::make('login');
}
// Process submission of the login form by verifying user’s credentials
public function processLogin()
{
$username = Input::get('username');
$password = Input::get('password');
if ($username === 'prince' && $password === 'c#spiAN') {
return 'Access granted!';
} else {
return 'Access denied! Wrong username or password.';
}
}
}

Answer 1

Add use Input; after Namespace ... and then use as Input::get(..) or don't add use and call \Input::get(..). Find more here: http://php.net/manual/pl/language.namespaces.php

Answer 2

You have to follow the namespace, as others told you in the comments.
Imagine it as a capitalized folder structure, now you are under App\Htt\Controllers, so it looks for App\Http\Controllers\Input.
Anything that is not directly under the same namespace must be referenced before the class declaration or prefixed with the full namespace adding a backslash \ at the beginning.
It depends on how many times you need to use it. If just once, then call it using the full path from the root. In this case it would be \Input (\Input::get(...)), otherwise reference it on the top and call it like you did in the question's code.
To better understand, in case of a model you'd need to call the class User as use App\User; on the top or directly as \App\User::all()(as example) inline in your method's code.