I’ve done a number of these migrations now – Nucleus, Drupal, Serendipity and others. The latest was Expression Engine – needed to move Shai’s blog over to WordPress. This was the catalyst I needed to write a base class for the WordPress import/export format known as WXR, or WordPress eXtended RSS.

For casual users, this is not for you. For developers, this may be a life saver for you.

The class can be downloaded via SVN:

svn co http://svn.aaronbrazell.com/wpwxr/trunk wpwxr

Included in this repository is the base class.wxr.php class along with sample code to build your own apps from.

Reference: Complete WordPress WXR Base Class documentation is online.

Instantiation: This is a base class. Therefore, you should never extantiate it directly – only via another class via extending.

class myNewClass extends WXR_export {

	function myfunction()
	{
		echo "Hello World!";
	}
}

Debug mode: If you wish to use debug mode, you can set the $debug property of the class to true. The default is false. If debug mode is on, output will be sent to the screen as opposed the the WXR file.

Example:

$n = new myNewClass;
$n->debug = true;

Export Filename: By default, the name of the WXR file is date based (e.g wxr-2008-01-26.xml). You can change this by changing the $export_filename property.

$w = new myNewClass();
$w->export_filename = 'file-movabletype.xml';

I’d love to get patches if you want to contribute. You should send them to emmensetech [at] gmail [dot] com. In addition, if you use this and create extension classes, I’m more than happy to host them. I’ll be seeding the pot with the Expression Engine class I used this weekend.

Exporters Built

• Expression Engine