Debugging PHP code is part of any project, but WordPress comes with specific debug systems designed to simplify the process as well as standardize code across the core, plugins and themes.
WP_DEBUG is a PHP constant (a permanent global variable) that can be used to trigger the “debug” mode throughout WordPress. It is assumed to be false by default and is usually set to true in the wp-config.php file on development copies of WordPress.
WordPress have a debug mode which allow you to easily get information when something goes wrong. To enable and disable debug mode, you have to add a constant to the wp-config.php file. But what about an easy way to switch on the debug mode, even without accessing wp-config.php?
The first thing to do is to add the following code to your wp-config.php file. This file is located at the root of your WordPress install.
if ( isset($_GET['debug']) && $_GET['debug'] == 'debug')
define('WP_DEBUG', true);
Once done, simply add a GET parameter to the url of the page you’d like to debug, as shown below:
http://wordpressexperts.net/contact?debug=debug
Thanks to Joost de Valk for this great tip!
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