PHP - 你会如何使建筑物或这样的东西完成等？

Question

So as you know in some browser-games such as Travian, Tribalwars and etcetera, you can build up a building, it takes X amount of time and it finishes. So I'm curious how that is done?

Is it a cron-job running every second or what? How are they then doing with troops, they can't have a cron-job running ever millisecond, that wouldn't be resource usage friendly, right?

So I'm really curious about this and I have no idea so I can't really say I have tried. I have however searched around but never found anything helpful.

Thanks.

Answer 1

The easiest way to implement something like this is simple timestamps. The request on the front end generates a timestamp based on the constraints given by the details of the request (what type of building you are building, what level you are, if you have bought the upgrade). Then a timestamp is inserted into the database for when the completion occurs. Then, if you want the browser to refresh when the job is up, you make a script on the js that makes a request for all timestamps in queue and reloads when they come up.