I've had a bee in my bonnet for a little while now and I've decided to get the ball rolling on creating my own web-based RPG game. But I'm not sure what the best route is with a programming language. I have some basic php knowledge and I've tried to find some sources regarding the best language to use but nothing has stood out predominantly. I know PHP does all the work server-side and I'm thinking that it might not work well if the server has a lot of people playing the game.
Any advice would be greatly appreciated.