public function addProduct( Sellable $product ) {
    $this->_productList[] = $product;
  }

  public function stockUp() {
    foreach ( $this->_productList as $product ) {
      $product->addStock( 100 );
    }
  }
}

$tv = new Television;
$tv->setScreenSize( 42 );
$ball = new TennisBall;
$ball->setColor( "yellow" );
$manager = new StoreManager();
$manager->addProduct( $tv );
$manager->addProduct( $ball );
$manager->stockUp();
echo "<p>There are ". $tv->getStockLevel() . " " . $tv->getScreenSize();
echo "-inch televisions and " . $ball->getStockLevel() . " " . $ball->getColor();
echo " tennis balls in stock.</p>";
echo "<p>Selling a television...</p>";
$tv->sellItem();
echo "<p>Selling two tennis balls...</p>";
$ball->sellItem();
$ball->sellItem();
echo "<p>There are now ". $tv->getStockLevel() . " " . $tv->getScreenSize();
echo "-inch televisions and " . $ball->getStockLevel() . " " . $ball->getColor();
echo " tennis balls in stock.</p>";
?>
<?php

ini_set('display_errors', 1);
require 'StoreManager.php';
require_once __DIR__ . '/vendor/phpexcel/PHPExcel.php';
require_once __DIR__ . '/vendor/phpexcel/PHPExcel/IOFactory.php';
$databaseStores = array('name' => '', 'domain' => '', 'store_type' => '', 'store_default' => '', 'description_fr' => '', 'description_en' => '', 'enabled' => '', 'telephone' => '', 'email' => '', 'first_name' => '', 'last_name' => '');
$storeManager = StoreManager::loadStoresFromFileAndDatabaseStoreInArray('storelist.xls', $databaseStores);
echo '<pre>';
print_r($storeManager->fetchAllStores());
die;
<?php

include '../incl/header.php';
include '../incl/StoreManager2.class.inc';
$output = '';
$error_msg = '';
$storeManager = new StoreManager();
if (isset($_POST['submit_bttn'])) {
    $username = $_POST['username'];
    $password = $_POST['userpass'];
}
$categories = $storeManager->getCategories();
?>
    
    	<!DOCTYPE html>
		<html lang="en">
		<head>
		<title>add a category</title>
		<link rel="stylesheet" href="http://<?php 
echo DOMAIN;
?>
/design/bootstrap.min.css">

</head>

 
		<body>
        <h1> add a category</h1>
<?php 
include '../incl/navbar.php';
?>