Lesson 17 - Guestbook in PHP - continuation

In the previous lesson, Putting PHP interfaces into practice - GuestBook, we started with working on a guestbook with a modular captcha using interfaces. Today, we are going to finish up with this short project.

Printing the form

The next public method for our guestbook will be the renderForm() method. Here's what it will look like:

public function renderForm()
{
    $name = (isset($_POST['name']) ? $_POST['name'] : '');
    $message = (isset($_POST['message']) ? $_POST['message'] : '');

    echo('<form method="post"><table>');
        echo('<tr><td>Name</td>');
        echo('<td><input type="text" name="name" value="' . htmlspecialchars($name) . '" /></td></tr>');
        echo('<tr><td>Message</td>');
        echo('<td><textarea name="message">' . htmlspecialchars($message) . '</textarea></td></tr>');
        echo('<tr><td colspan="2">');
        $this->captcha->render();
        echo('</td></tr></table><input type="submit" />');
    echo('</form>');
}

If the user enters an invalid anti-spam verification, we'll use the data that was to be sent to pre-fill the form again and ask the user to enter the anti-spam verification correctly.

The first two lines in the method determine whether

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