Добавить виджет к сайту wordpress

<?php 
/**
 * Adds Foo_Widget widget.
 */
class Foo_Widget extends WP_Widget {

	/**
	 * Register widget with WordPress.
	 */
	function __construct() {
		parent::__construct(
			'foo_widget', // Base ID
			esc_html__( 'Phone and min price', 'text_domain' ), // Name
			array( 'description' => esc_html__( 'Change price and phone', 'text_domain' ), ) // Args
		);
	}

	/**
	 * Front-end display of widget.
	 *
	 * @see WP_Widget::widget()
	 *
	 * @param array $args     Widget arguments.
	 * @param array $instance Saved values from database.
	 */
	public function widget( $args, $instance ) {
		echo $args['before_widget'];
		if ( ! empty( $instance['title'] ) ) {
			echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ) . $args['after_title'];
		}
		echo esc_html__( 'Hello, World!', 'text_domain' );
		echo $args['after_widget'];
	}

	/**
	 * Back-end widget form.
	 *
	 * @see WP_Widget::form()
	 *
	 * @param array $instance Previously saved values from database.
	 */
	public function form( $instance ) {
		$phone = ! empty( $instance['phone'] ) ? $instance['phone'] : esc_html__( 'phone', 'text_domain' );
		$minprice = ! empty( $instance['minprice'] ) ? $instance['minprice'] : esc_html__( 'minprice', 'text_domain' );
		?>
		<p>
		<label for="<?php echo esc_attr( $this->get_field_id( 'phone' ) ); ?>"><?php esc_attr_e( 'Number:', 'text_domain' ); ?></label> 
		<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'phone' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'phone' ) ); ?>" type="text" value="<?php echo esc_attr( $phone ); ?>">
		</p>
		<p>
		<label for="<?php echo esc_attr( $this->get_field_id( 'minprice' ) ); ?>"><?php esc_attr_e( 'minprice:', 'text_domain' ); ?></label> 
		<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'minprice' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'minprice' ) ); ?>" type="text" value="<?php echo esc_attr( $minprice ); ?>">
		</p>
		<?php 
	}

	/**
	 * Sanitize widget form values as they are saved.
	 *
	 * @see WP_Widget::update()
	 *
	 * @param array $new_instance Values just sent to be saved.
	 * @param array $old_instance Previously saved values from database.
	 *
	 * @return array Updated safe values to be saved.
	 */
	public function update( $new_instance, $old_instance ) {
		$instance = array();
		$instance['phone'] = ( ! empty( $new_instance['phone'] ) ) ? sanitize_text_field( $new_instance['phone'] ) : '';
		$instance['minprice'] = ( ! empty( $new_instance['minprice'] ) ) ? sanitize_text_field( $new_instance['minprice'] ) : '';

		return $instance;
	}

} // class Foo_Widget