You’ve seen it before: the monster Joomla installation package. It’s a giant component, several side modules, and at least one plugin. Once you dig through the code, you notice the plugin isn’t even responding to events: it’s merely there to load up code shared by the other extensions.
Fortunately, Joomla 1.6 and higher provide a better way of handling this. Reusable code libraries can now be installed into the libraries folder without creating extraneous plugins. Just like any other extension in Joomla, a library is packaged as a .zip file with an XML manifest to guide the installation.
If you’ve created Joomla XML manifest files before, creating one for a library is straightforward. The main thing you need to keep in mind is the added
JForm is one of the most exciting new features to be introduced as part of Joomla! 1.6. The intention is to provide XML configurable forms complete with custom field types and form validation. I cannot stress enough just how much easier this is going to make life as a Joomla! developer. In this article we take a look at how to define JForms and how to display them.
Session storage is a very important aspect of web applications. In its simplest form, a PHP session allows data to be stored temporarily on the server and accessed throughout a user's time on the site. When that user leaves the site or is inactive for a certain amount of time, the data is destroyed. While anonymous sessions are common, sessions are usually associated with user logins. When a correct username/password combination is entered, a session is created around that user's access information and then read and checked every time that user loads a page. As a developer, you can access this session functionality to enhance your extensions.
Have you ever browsed to a website only to find that half the content is unreadable? Or that certain characters are being displayed in strange and mysterious ways? Or perhaps you wanted to enter a foreign or unusual character but found that the result was a garbled mess.
The chances are you have been subject to poorly managed character encodings. Joomla! extensions are no exception to these occurrences, but with a little bit of effort and some help from the Joomla! framework, we can avoid these problems with relative ease.
Debugging PHP applications has always been a bit of a challenge, as the environment is so distributed. At the minimum, there is a web server, the PHP interpreter, and the web browser. While there are tools that add debugging environments to PHP (such as XDebug), you don’t always have access to install them on the server you’re working with.
Fortunately, you can gain some reasonable debugging capabilities through FirePHP. When you want to dump objects or variables back to your browser without having to do so in your HTML, FirePHP is ready for the task. It can also be used to handle code traces and PHP errors.
FirePHP is both a Firebug extension and a PHP library. When the PHP library is in place, special HTTP headers containing JSON objects are created. Firebug reads the HTTP headers, decodes the JSON, then shows the variables in the console. Since the output body is unaffected, it is extremely useful for debugging XML, JSON, PDFs, images, or other non-HTML output generated in PHP.