What is the proper way to determine the local path to your plugin files?

What is the function that check if the user is logged in?

The WordPress default theme consists of the following items:

When using translatable text strings in a JavaScript file, which function localizes those strings for the JavaScript file?

What function do you use to programmatically update a post?

Does WordPress have official unit tests?

Which template tag is used to optionally display a list of the pages in a page or blog post that has been split into multiple pages (using )?

What color picker JavaScript library shipped with version 3.4?

Can you properly add you own WP code before the first action hook 'plugins_loaded' without hacking the core ?

In which hook is the safest to fire a remove_menu_page to menus created by plugins?

In the case of a free WordPress.com blog, the number of users that can be invited by a registered user is: