Design Pattern - Abstract Factory Pattern Implementation in PHP

Products Class that are like

Table Chair etc

Pls review it and give your thoughts and let me know if there are any rooms for improvisation.

Products.php

<?php

abstract class Products
{

}

class Table extends products
{
    public function __construct()
    {
        echo "New Table Created";
    }
}

class Chair extends products
{
    public function __construct()
    {
        echo "New Chair Created";
    }
}

Factory Class That can produce Plastic Furniture, Wooden Furniture

<?php
include "products.php";

abstract class FurnitureFactory
{
    abstract function building();
}

class WoodenFactory extends FurnitureFactory
{
    const TABLE = 1;
    const CHAIRS = 2;

    public function building()
    {
        echo "Building Wooden Furniture";
    }

    public function makeWoodenTable()
    {
        echo "Wooden ";
        return new Table();
    }

    public function makeWoodenChair()
    {
        echo "Wooden ";
        return new Chair();
    }
}

class PlasticFactory extends FurnitureFactory
{
    public function building()
    {
        echo "Building Plastic Furniture";
    }
}

$wfactory = new WoodenFactory();
$wtable = $wfactory->makeWoodenTable();
$wchair - $wfactory->makeWoodenChair();