<form method="post" action="login.php">
						<label>Benutzername:</label>
						<input type="name" name="username" required />
						<label>Passwort:</label>
						<input type="password" name="password" required /><br />
						<input type="submit" name="submit" value="Einloggen" />
					</form>
					<?php
						if(isset($_POST['submit'])) {

							$username = $_POST['username'];
							$passwort = $_POST['password'];

							if($username == "LkLp1082" && $passwort == "123456789abcdefghi") {
								$_SESSION['userLoggedIn'] = true;
							} else {
								echo "Dein Benutzername oder Passwort ist falsch. Bitte versuche es erneut!";
							}
						}
					?>
				</p>
				<?php
					if($_SESSION['userLoggedIn'] == true) {
						?>
						<hr />
						<p>Eingelogt</p>
						<form method="POST" action="login.php">
							<input type="submit" name="submit_logout" value="Logout">
						</form>
						<?php
						if(isset($_POST['submit_logout'])) {
							session_destroy();
							?>
							<script language="JavaScript">
								window.document.location.href = "login.php";
							</script>
							<?php
						}
					}
				?>