Lesson 21 - E-shop in PHP - ProductHelper and JavaScript
In the previous lesson, E-shop in PHP - Product detail logic, we prepared the models and the controller
for product details as well as user reviews. In today's tutorial, we'll prepare
everything needed to add the product template to our project 
Helper
Since we want to work with products in a serious manner, we'll need a ProductHelper class. Its main purpose will be price formatting and displaying star ratings. We'll need to use these things from several places in the application. Otherwise, we'd have to copy loops and conditions into the template, which would make things really confusing.
app/helpers/ProductHelper.php
class ProductHelper
{
}
rating()
This method will generate empty and full stars as Bootstrap glyph icons, based on the sum of the product ratings and their count. If the number of ratings isn't included, it'll simply treat the sum as the number of stars that it needs to render.
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In this tutorial, we'll add the ProductHelper to our e-shop, prepare the styles, add a license for a bootstrap template, and JavaScript for star rating.
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