fictizia-widget.php

<?php


class Fictizia_Widget extends WP_Widget {

	// El nombre de la clase tiene que coincidir con esta función
	function Fictizia_Widget() {
		// Argumentos
		$args = array( 'classname' => 'fictizia-widget', 'description' => __( 'Fictizia Widget Description', 'fictizia' ) );

		// La clase superior es la que se encarga de crear realmente el widget
		parent::WP_Widget( false, __( 'Fictizia Widget', 'fictizia' ), $args );	
	}

	function form( $instance ) {
		$defaults = array( 
			'title' => 'Fictizia Widget'
		);
		$instance = wp_parse_args( $instance, $defaults );
        ?>
            <p>
            	<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> 
            		<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'] ); ?>" />
            	</label>
            </p>
        <?php 
	}

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

		$title = sanitize_text_field( $new_instance['title'] );
		if ( ! empty( $title ) )
			$instance['title'] = $title;

		return $instance;

	}

	function widget( $args, $instance ) {
		extract( $args );
        $title = apply_filters( 'widget_title', $instance['title'] );

        ?>
              <?php echo $before_widget; ?>
                  <?php if ( $title )
                        echo $before_title . $title . $after_title; ?>
                  Hola, mundo
              <?php echo $after_widget; ?>
        <?php
	}

}

add_action( 'widgets_init', 'fictizia_register_widget' );
function fictizia_register_widget() {
	register_widget( 'Fictizia_Widget' );
}