It is used as a general scripting language for a lot of the sites out on the web right now. There are more than 20 Million web sites operating with this versatile language that uses Pearl applications to embed the HTML code into the web sites that will help you in many of the e-commerce activities as well as the security issues. Many of the web sites that utilize such revenue generators as Google Adsense use PHP imbedded HTML to assist in the operation of this money making activity.
If you want to make sure that a PHP hosting system is the one for you, take a good look at the applications that can be run on your web pages that will help you do the things that you want done, then make sure that the hosting company you have, or are looking into, has the capabilities to use this system. There are more than a million web servers that have this facility, so the search should not be a problem.