Function: Retrieve user data based on field.

Function: Callback used to change %uXXXX to &#YYY; syntax

Function: Fixes JavaScript bugs in browsers.

Function: Checks that the taxonomy name exists.

Function: Check if Term exists.

Function: Determines whether the current admin page is generated by a plugin.

Function: Update the categories cache.

Function: Registers widget control callback for customizing options.

Function: Alias of wp_unregister_widget_control().