I need a PHP script to calculate taxi fares between locations for a taxi company. The journeys will be stored in either a flat file or database, and there will need to be a web form with two drop down boxes, a start location, and end location. The script will need to lookup the cost of this journey and return this to the user, as well as form part of a contact form so the details can be emailed. The prices for the journeys, the destinations etc. will need to be customisable, so can be added to, amended and deleted. There is no database currently, so the journeys could be stored in one, or looked up via some other method such as a text file.