How to reset a timer every minute if there is no query to the database?

I have a basic server in PHP and from the mobile device I send data and save the server every 1 minute.

But when ever my mobile phone loses the connection, I would like to set a counter on the server and if the mobile does not insert anything the database longer than 2 min. I would like to call a function in the server saying that your mobile lost connection. E开发者_C百科very time the mobile phone sends the data to the server, timer will be reset.

I am not familiar to PHP but I searched and couldn't find any similar things. I am sure there must be an easy way of doing it. setting a listener or creating a count down timer.

You can't set a timer in your PHP code as it runs only when a client requests a page.

As you doesn't have an access to CRON jobs, you can't do it from CLI side either.

However, some webservices allow you to periodically call a page of your choice, so you can save() on every http://something/save.php call. Take a look at http://www.google.fr/search?ie=UTF-8&q=online+cron for more informations.

Note that if someone get the save() url, he can easily overload your server. Try to secure it as most as possible, maybe with a user/password combination passed as parameters.

Finally I got it worked. What I learned is that the server cant do anything if there is no request:) So I created a timestamp field in the database and update the current time with the request. Of course before updating the field gets it and compare it with the current time and see when was the last request. and find out the time difference. if the time difference bigger than 2 min change the position. I hope this helps other people as well.