Laravel 5 - Allow user to login with either username or email

AuthController.php

<?php

namespace App\Http\Controllers\Auth;

use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;

class AuthController extends Controller
{
    public function loginPost(Request $request)
    {
        $useremail = $request->input('useremail');
        $password = $request->input('password');
        $remember = $request->input('remember');

        // Check if user is using email or username
        $field = filter_var($useremail, FILTER_VALIDATE_EMAIL) ? 'email' : 'username';

        $credentials = [
            $field => $useremail,
            'password' => $password,
        ];

        // check if user is authentic
        if (auth()->attempt($credentials, $remember)) {
            // check if email has been verified
            if (!auth()->user()->verified()) {
                auth()->logout();
                session()->flash('error', 'You must verify your email before you can access the site. ' .
                    '<br>If you have not received the confirmation email check your spam folder. ' .
                    '<b><a class="alert-link" href="' . route('resend.email') . '" class="alert-link">Click here</a></b> for the option to resend.');

                return redirect()->route('home');
            }
            //event(new UserHasLoggedIn(auth()->user()));
            session()->flash('success', 'Successfully logged in!');

            return redirect()->intended(route('home'));
        }
        session()->flash('error', 'Your [Username/Email] and/or Password is incorrect!');

        return redirect()->back()->withInput();
    }
    
    // ...
    
}

email.jpg

login.html

<div class="row">
	<div class="col-md-6 col-md-offset-3">

		<div class="well">
			{!! Form::open(['route' => 'login', 'class' => 'form-horizontal']) !!}
			<fieldset>

				<legend>Login</legend>

				<div class="form-group @if ($errors->has('useremail')) has-error @endif">
					<div class="col-md-12">
						<label class="control-label">Username or Email</label>
						{!! Form::text('useremail', null, ['class' => 'form-control', 'placeholder' => 'Username or Email', 'required' => '']) !!}
						@if ($errors->has('useremail'))
							<span class="help-block">{{ $errors->first('useremail') }}</span>
						@endif
					</div>
				</div>

				<div class="form-group @if ($errors->has('password')) has-error @endif">
					<div class="col-md-12">
						<label class="control-label">Password</label>
						{!! Form::password('password', ['class' => 'form-control', 'placeholder' => 'Password', 'required' => '']) !!}
						@if ($errors->has('password'))
							<span class="help-block">{{ $errors->first('password') }}</span>
						@endif
					</div>
				</div>

				<div class="form-group">
					<div class="col-md-12">
						<div class="checkbox">
							<label>
								<input name="remember" type="checkbox"> Remember me?
							</label>
						</div>
					</div>
				</div>

				<button type="submit" class="btn btn-sm btn-success">Login</button>

			</fieldset>
			{!! Form::close() !!}
		</div>

	</div>
</div>

routes.php

Route::get('/', ['as' => 'home', 'uses' => 'HomeController@index']);

Route::group(['middleware' => 'guest'], function () {

    Route::get('login', ['as' => 'login', 'uses' => 'Auth\AuthController@login']);
    Route::post('login', ['uses' => 'Auth\AuthController@loginPost']);

});

What if your username is an email address but different than your email?

This is quite messy. You're doing more queries than you need to?

@bbashy - how is that? Didn't notice I was running the same query twice. The reason I do not implement the verified check in the credentials array as an additional column check is because I want to see if the login failed for failed password, or because they are not verified if you were wondering.