I believe Halls has a tutorial about this somewhere, but he will have to chime in on where it is exactly, but it would take all of the above: PHP, Javascript and a database. The real-time countdown would have to be done with Javascript since that is the main way you show real-time animations. However, the JS countdown animation is just for the player's reference, and is not what is enforcing it. What actually would be enforcing the countdown is PHP referencing the time the countdown started from the database. When a player starts building, you would need to use PHP to add the time to a special table in the database, and then anytime the player tries to do something else (say they pull another page up from their browser history or just try to do something else), check to see if they are in that table, and if they are they must still be in a building countdown. Compare the current time to the time in the database record, and use the time difference to recreate the Javascript countdown timer with maybe a message telling them they can't do that yet because they have X time until building is complete. Or, if you don't want to stop them from doing other things, you could simply add the JS timer on a sidebar of the page so they can keep tabs on how the building process is going.
Hope this helps until Halls can advise you on where in his tutorials the JS countdown is
... do u guys know any tutorials for this? or can someone explain me ? please help me
