Lesson 17 - Guestbook in PHP - continuation

PHP OOP 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('<td><input type="text" name="name" value="' . htmlspecialchars($name) . '" /></td></tr>');
                echo('<td><textarea name="message">' . htmlspecialchars($message) . '</textarea></td></tr>');
                echo('<tr><td colspan="2">');
                echo('</td></tr></table><input type="submit" />');

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


...End of the preview...

Premium article

Premium article

ict.social is a large database made up of manuals and tutorials, whose main goal is to provide high-quality IT education to everyone. We started out in the Czech republic, where we display roughly a million articles per month and receive plenty of gratitude from our users. Thanks to our successful establishment, we are now bringing these articles to the rest of the world.

Although we are trying to keep our content free of charge, maintaining the site is a huge effort for everyone involved. Therefore, some content (exercises and more advanced material) costs network points. Don't worry, they're really cheap :)

Article description

Requested article covers this content:

In this lesson, we're going to finish our PHP guestbook and change it's captcha implementation to image-based responses using our modular interface.

Buy just this article

To access the article, you need 10 points
Currently, you have 0 points
You gain 10 points for adding an article to the site, or for $0.90

Buying this article gives you unlimited access to it forever. You will learn some more and help us keep giving our site maintenance which helps you and others get better futures. It's a win-win.

This article is licensed :Premium, by buying this article, you agree with the terms of use.

You gain points by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.

You can get points immediately using:

Credit card SMS Wire transfer
Credit card SMS Wire transfer


Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at ICT.social. He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn College The author learned IT at the Unicorn College - a prestigious college providing education on IT and economics.
Activities (8)