Looping problem

[seikan]

I'm doing a PHP script timer and write the duration to MySQL database every second. The code is something like this:

for($i=0; $i<60; $i++){
//Update MySQL database
sleep(1);
}

However, this script won't stop after I close my browser. It keep updating my database until it finish the loop. Is there any solution for this?

Thank you!

[sneakyimp]

Create an AJAX function instead? Once you leave the page, the Javascript would stop running.