if (isset($_POST['submit'])){
    $username = $_POST['username'];
    $password = $_POST['password'];
       $q = $handler->prepare('SELECT * FROM users WHERE username = ?');
       $result = $q->execute(array($username));

        if ($q->rowCount() > 0){
            $result = $q -> fetch(PDO::FETCH_ASSOC);
            $hash_pwd = $result['password'];
            $hash = password_verify($password, $hash_pwd);

            if ($hash == 0) {
                error_log("hashwrong");
                echo '<p class="error-message3">'.'<br>'.'<br>'."You have ented an incorrect login!     <br>Please try again.".'</p>';
            }
               else {
                 $_SESSION['username'] = $username;
                     error_log("loggedin");
                     header("location: index.php");return;
               }
          }
     }
 ?>