public function controllo_login() {
		if($_SESSION['username']) {
			header("Location: ../me.php");
			exit;
		}

		if(!isset($_GET['login'])) {
			$_GET['login'] = 'no';
		}

		if($_GET['login'] == "ok") {
			/*FILTRO LE VARIABILI & CRYPTO LA PASSWORD PER MAGGIORE SICUREZZA IN USCITA DAL FORM */
			$username = $this->Filtro($_POST["username"]);
			$password = $this->Filtro($_POST['password']);
			$password = sha1($password);

			if(isset($username, $password)) {
				/* ESEGUO LE QUERY UTILI */
				$query = $this->conn->prepare("SELECT * FROM users WHERE username = :nomeutente");
				$query->execute(array('nomeutente' => $username));
				$num_usr = $query->rowCount();
				$fields_usr = $query->fetch(PDO::FETCH_ASSOC);
				$query2 = $this->conn->prepare("SELECT * FROM bans WHERE value = :nomeutente");
				$query2->execute(array('nomeutente' => $username));
				$num_ban = $query2->rowCount();
				if ($num_usr == 0) {
					$err= "L'utente non esiste!";
				} elseif($num_ban >= 1) {
					$err= "Sei stato bannato!";
				} elseif($password != $fields_usr['password']) {
					$err= "Password non corretta!";
				} elseif($password == $fields_usr['password']) {
					$_SESSION['username'] = $fields_usr['username'];
					$_SESSION['password'] = $fields_usr['password'];
					header('location: ../me.php');
					exit;
				}
			}
			echo '<center><div id="errore">'.$err.'</div></center>';
		}
	}