Manager for WordPress’ contact fields

class.TTT_Contactfields.php

<?php
/**
 * Manage WordPress contact fields.
 * Usage:
require './class.TTT_Contactfields.php';

$TTT_Contactfields = new TTT_Contactfields(
	array (
		'Twitter'
	,	'Facebook'
	,	'Xing'
	,	'Country'
	,	'City'
	,	'Latitude'
	,	'Longitude'
	)
);
 * @author "Thomas Scholz" http://toscho.de
 * @version 1.0
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 */
class TTT_Contactfields {
	public
		$new_fields
	,	$active_fields
	,	$replace
	;

	/**
	 * @param array $fields New fields: array ('Twitter', 'Facebook')
	 * @param bool $replace Replace default fields?
	 */
	public function __construct($fields, $replace = TRUE)
	{
		foreach ( $fields as $field )
		{
			$this->new_fields[ mb_strtolower($field, 'utf-8') ] = $field;
		}

		$this->replace = (bool) $replace;

		add_filter('user_contactmethods', array( $this, 'add_fields' ) );
	}

	/**
	 * Changes the contact fields.
	 * @param  $original_fields Original WP fields
	 * @return array
	 */
	public function add_fields($original_fields)
	{
		if ( $this->replace )
		{
			$this->active_fields = $this->new_fields;
			return $this->new_fields;
		}

		$this->active_fields = array_merge($original_fields, $this->new_fields);
		return $this->active_fields;
	}

	/**
	 * Helper function for your theme
	 * @return array The currently active fields.
	 */
	public function get_active_fields()
	{
		return $this->active_fields;
	}
}