user.class.php

class cfd_user {
    protected $profile_fields = array(
		'user_login' => null,
		'user_nicename' => null,
		'user_url' => null,
		'user_email' => null,
		'display_name' => null,
		'nickname' => null,
		'first_name' => null,
		'last_name' => null,
		'description' => null,
		'rich_editing' => null,
		'user_registered' => null,
		'role' => null,
		'jabber' => null,
		'aim' => null,
		'yim' => null,
		'googleplus' => null,
		'twitter' => null,
		'use_ssl' => 0,
		'admin_color' => null,
		'comment_shortcuts' => null,
	);

...