need a php programmer -- 2

I need a programmer that can install a b2b php script, and make the fallowing changes to the scrip: Detect the languageof the user automatically based on the language of their browser, and forward them to the right language. Change image buttons totext buttons, formatted with google web fonts. -*Add functionality to pay for and display ads(people would be able to add an image or text add,pay using paypal,and the ad would appear automatically on the top). -*Add functionality to pay for certain category of listings. You would add that a category can be free or pay and how much money they would have to pay to list under that category, price would be entered by category, and would be charged using paypal. After they pay , the listing would go live. -Add better fields for address, city,country and generally speaking, location.I would like to be able to generate a listing. -Change listings by defauld so they appear sorted by distance, from close to farther distance. If there are multiple listings on a city,eventually I would like that to be shown sa part of to facilitate seo. -*Make sure that the page title, description of each listing is seo optimized (fallowing craigslist template). -*Add functionality to create email alerts,so an email will be sent automatically every day (kind of like Google Alerts) with the listings that match certain keywords. Suggest any other changes you would make in order to make this more user friendly I really would like something where it is very easy and quick to sign up for, to search and to list. If you have a b2b script that already has all this functionality,please let me know.