With 25,000+ commits from 175+ contributors in only 18 months, PrestaShop’s GitHub branches are an enormous success. Use this Github Tutorial to join in on the action.
Everyone asks should my app be free or paid. For indie developers, the answer is mostly always no. Find out why indie developers go broke and how to fix it.
This is a forum thread dealing with this topic which goes on to describe what $_html = is for.
This thread also discusses OOP programming