Adding custom fields to the user editor
Similar to the taxonomy editor, the user editor allows developers to add extra fields through action hooks and facilitates this task by using the same HTML structure, whether a new user is being created or an existing one is modified. This recipe shows how to assign a callback function to add a new section to the user editor.
Getting ready
To create a complete plugin with a stylesheet and administration panel, you should have already followed the Storing stylesheet data in user settings recipe in Chapter 3, User Settings and Administration Pages, to have a starting point for this recipe. Alternatively, you can get the resulting code (Chapter 3/ch2-private-item-text-edit-stylesheet/ch2-private-item-text.php) from the downloaded code bundle and rename ch2-private-item-text-edit-stylesheet to ch2-private-item-text.
It is also possible to just create a new empty plugin file and follow this chapter's recipes by making a folder called ch2-private-item-text...
