gistfile1.php

<?php

class WP_Widget_Text_HTML_In_Title extends WP_Widget {

	function __construct() {
		$widget_ops = array( 'classname' => 'widget_text_html_in_title', 'description' => 'Arbitrary text or HTML. Allows HTML in title field.' );
		$control_ops = array( 'width' => 400, 'height' => 350 );
		parent::__construct( 'text-html-in-title', 'Text (Allows HTML In Title)', $widget_ops, $control_ops );
	}

	function widget( $args, $instance ) {
		extract($args);
		$title = empty( $instance['title'] ) ? '' : $instance['title'];
		$text = apply_filters( 'widget_text', empty( $instance['text'] ) ? '' : $instance['text'], $instance );
		echo $before_widget;
		if ( !empty( $title ) ) { echo $before_title . $title . $after_title; } ?>
			<div class="textwidget"><?php echo !empty( $instance['filter'] ) ? wpautop( $text ) : $text; ?></div>
		<?php
		echo $after_widget;
	}

	function update( $new_instance, $old_instance ) {
		$instance = array();

		if ( current_user_can('unfiltered_html') ) {
			$instance['title'] = $new_instance['title'];
			$instance['text']  = $new_instance['text'];
		} else {
			$instance['title'] = wp_kses_post( $new_instance['title'] );
			$instance['text']  = wp_kses_post( $new_instance['text'] );
		}

		$instance['filter'] = isset( $new_instance['filter'] );

		return $instance;
	}

	function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array( 'title' => '', 'text' => '', 'filter' => false ) );
?>
		<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
		<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" /></p>

		<textarea class="widefat" rows="16" cols="20" id="<?php echo $this->get_field_id('text'); ?>" name="<?php echo $this->get_field_name('text'); ?>"><?php echo esc_textarea( $instance['text'] ); ?></textarea>

		<p><input id="<?php echo $this->get_field_id('filter'); ?>" name="<?php echo $this->get_field_name('filter'); ?>" type="checkbox" <?php checked(isset($instance['filter']) ? $instance['filter'] : 0); ?> />&nbsp;<label for="<?php echo $this->get_field_id('filter'); ?>"><?php _e('Automatically add paragraphs'); ?></label></p>
<?php
	}
}

function widget_text_html_in_title_register() {
	register_widget( 'WP_Widget_Text_HTML_In_Title' );
}

add_action( 'widgets_init', 'widget_text_html_in_title_register');