Function: Retrieve user data based on field.

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

Function: Fixes JavaScript bugs in browsers.

Function: Escape single quotes, specialchar double quotes, and fix line endings.

Function: Escaping for HTML attributes.

Function: Register widget for sidebar with backward compatibility.

Function: Serves as an alias of wp_unregister_sidebar_widget().

Function: Registers widget control callback for customizing options.