In your PHP classes, accessing all your private members
Implementation isn't always clean. Sometimes you'll have to get your code dirty.
PHP
How to set the WPML language locale of an AJAX call
Enable WordPress AJAX requests to set the language locale through WPML with this small patch.
How I built a website in just one weekend
A guide to building a website from start to finish. Get your site out instead of your hair.
Multilingual WordPress themes with I18n and L10n
Having a fully translatable WordPress theme can save you a lot of work, and here's how.
HTTP 404 response causes forced downloads to fail
An interesting gotcha that I stumbled across recently, sending a 404 response code with a download forced by Content-Disposition: attachment will fail but inline content will still be displayed. This behaviour was tested in both Chrome and FireFox.
Of course the appropriate response code should always be sent; this 404 response code was being sneaked in by WordPress and led to hours of frustration.
wp_list_pages() not setting .current_page_item classes on custom post types
A rather frustrating bug that I became aware of when generating navigational menus for custom post types using wp_list_pages(). The list entries aren’t decorated with useful classes denoting the current item, the parent item, and ancestor(s).
Read about the issue here.