echo '<td>
                        <form method="GET" action="/showEditUserPage">
                            <input type="hidden" name="id" value="' . $row['id'] . '"/>
                            <input type="hidden" name="username" value="' . $row['username'] . '"/>
                            <input type="submit" value="EDIT" name="showEditUserPage"/>
                        </form></td>';


public function editUser(){


        $username = $_POST["username"];
        $id = $_POST["id"];
        try {
            require CONTROLLER_DIR . '/dbConnecterController.php';
            $result = $db->query('SELECT * FROM users WHERE username="'.$username.'"');

            $row = $result->fetchColumn();
                if(!$row == 0){
                    // To be continued
                    $statement = $db->query("UPDATE users SET username ='$username' WHERE id = '$id'");
                    $db = null;
                    return true;
                } else {
                    die("No data present.");
                }

        } catch (PDOException $e) {
            print "Error!: " . $e->getMessage() . "<br/>";
            die();
        }
    }