ajax - PHP checking a value every 5 seconds without a present client -


i have website idea @ moment , need timer fired every 5 seconds without users input check if remote value (a value on remote file) has changed value. need make server side c++ script this? want keep php if can if have make external script. ajax able this?

you can use cron ( http://en.wikipedia.org/wiki/cron ) unix based systems , windows task scheduler ( http://support.microsoft.com/kb/308569 ) windows


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