WordPress Plugin: T5 Log In Form Widget

login-form-widget.php

<?php # -*- coding: utf-8 -*-
/**
 * Plugin Name: T5 Log in form widget
 * Plugin URI:  https://gist.github.com/toscho/c7459ee439fd2491c1f6
 * Description: Shows a log in form in a widget.
 * Version:     13.10.15
 * Required:    4.0
 * Author:      Thomas Scholz <info@toscho.de>
 * Author URI:  http://toscho.de
 * License:     MIT
 * License URI: http://www.opensource.org/licenses/mit-license.php
 */

class T5_Login_Form_Widget extends WP_Widget {

	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct( strtolower( __CLASS__ ), __( 'Log In' ) );
	}

	/**
	 * Outputs the settings update form.
	 *
	 * @since 2.8.0
	 * @access public
	 *
	 * @param array $instance Current settings.
	 * @return string Default return is 'noform'.
	 */
	public function form( $instance )
	{
		$instance = wp_parse_args( $instance, array( 'title' => '' ) );

		print $this->get_title( $instance[ 'title' ] );

		return '';
	}

	/**
	 * @param string $title
	 *
	 * @return string
	 */
	private function get_title( $title )
	{
		$title    = esc_attr( $title );
		$field_id = $this->get_field_id( 'title' );
		$name     = $this->get_field_name( 'title' );
		$label    = __( 'Title:' );

		return "<p>
			<label for='$field_id'>$label
				<input class='widefat' id='$field_id' name='$name' value='$title' type='text'>
			</label>
		</p>";
	}

	/**
	 * @param array $new_instance New settings for this instance as input by the user via
	 *                            WP_Widget::form().
	 * @param array $old_instance Old settings for this instance.
	 * @return array Settings to save or bool false to cancel saving.
	 */
	public function update( $new_instance, $old_instance )
	{
		$new_instance[ 'title' ] = esc_attr( $new_instance[ 'title' ] );

		return $new_instance;
	}

	/**
	 * Echoes the widget content.
	 *
	 * @param array $args     Display arguments including 'before_title', 'after_title',
	 *                        'before_widget', and 'after_widget'.
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	public function widget( $args, $instance )
	{
		$title = '';

		if ( ! empty ( $instance['title' ] ) )
			$title = $args['before_title'] . $instance['title'] . $args['after_title'];

		print $args['before_widget'] . $title;
		wp_login_form();
		print $args['after_widget'];
	}

	/**
	 * @wp-hook widgets_init
	 * @return void
	 */
	public static function register()
	{
		register_widget( __CLASS__ );
	}
}

add_action( 'widgets_init', array ( 'T5_Login_Form_Widget', 'register' ) );