Seller will upload an image(for example: world map). Buyer will select part of image(for example : part of world map. that is a country) to buy. Selection will be not only in map shape. Some cases, It will be in square shape or traingle shape. How can you do it using PHP/MySQL/javascript? Reply your solution here with script and demo! All the Best.
Lol... "reply with your solution here with script and demo" Do it yourself. Or pay someone to do it for you. It's one thing to ask for help on code you already written or even ask for different ideas on how to do something..but it is completely ignorant to expect someone to not only build the entire script for you but to also supply you with a demo so you don't have to waste any time to see if it's what you want. You are ridiculous. Stop wasting peoples time.