WP: Widget Boilerplate

widget-boilerplate.php

<?php 

class Foo_Widget extends WP_Widget {

	public function __construct() {
		parent::__construct(
	 		'foo_widget', // Base ID
			'Foo_Widget', // Name
			array( 'description' => __( 'A Foo Widget', 'text_domain' ), ) // Args
		);
	}

	
	public function widget( $args, $instance ) {
	
		extract( $args, EXTR_SKIP );
		
		echo $before_widget;
		
    	$title = apply_filters('widget_title', empty( $instance['title'] ) ? __( 'Widget Name', 'widget-name-locale' ) : $instance['title'], $instance, $this->id_base);
    

		
		echo $after_widget;
		
	}
	
	public function update( $new_instance, $old_instance ) {
	
		$instance = $old_instance;
		
		// TODO Update the widget with the new values
		// Note that this 'Title' is just an example
		$instance['title'] = strip_tags( $new_instance['title'] );
    
		return $instance;
		
	}
	
	public function form( $instance ) {
	
    	// TODO define default values for your variables
		$instance = wp_parse_args(
			(array) $instance,
			array(
				'title'	=>	__( 'Widget Name', 'widget-name-locale' ),
			)
		);
		?>
			<p>
				<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'widget-name-locale' ) ?></label>
				<input type="text" class="widefat" value="<?php esc_attr_e( $instance['title'] ); ?>" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" />
			</p>
		<?php
		
	} 

} 

// TODO remember to change 'leje_widget_taxonomy' to match the class name definition
add_action( 'widgets_init', create_function( '', 'register_widget( "foo_widget" );' ) );