using time to change stuff

[YodaOfCamarilla]

hi how can I make it so something will increase by 1 every 10 mins?
Ive tried this but it doesnt seem to work.

$c1oturns=floor($c1oturns+(($newtime-$oldtime)/600)) the last time they clicked on a page, and is retrieved from a table
$oldtime=date("U") the last time they clicked on a page, and is retrieved from a table**

$newtime=date("U");
$c1nturns=floor($c1oturns+(($newtime-$oldtime)/600));
$test1=$newtime/600;
$test2=floor($newtime/600);
if($remaindertime1!=$remaindertime2)
{
$newtime-=60;
}
else
{
$newtime=$newtime;
}

[jeremuck]

you could do two things:

One is have a script run on the server indefinitely like:

// 60 seconds * 10 minutes
$interval = 60 * 10;

while(1)
{
sleep($interval);

// do this every time minutes

}

Have that run as a shell script.
Or you could set up a cron job.