Is my Logic Correct?

[Lamez]

I am working on timed session for my project. So they have X minuets per pages to indicate some activity before the systems logs them out. Here is how I am going about this:

 

At the login function: set time limit, store session time in a session variable.

 

In main.php (included on every page): check time with expiredTime() function

 

if this returns false, then call the updateTime() function, else logout.

 

Here are my functions:

function startTime($min){ //Starts the time clock (TC), should only be used in the loginAdmin and updateTime functions.
$min *= 60;
if(!isset($_SESSION['~TC:Min']) || $_SESSION['~TC:Min'] != $min)
	$_SESSION['~TC:Min'] = $min;

$_SESSION['~TC:Time'] = time() + $_SESSION['~TC:Min'];
}
function updateTime(){
startTime($_SESSION['~TC:Min']); //No need to do the same thing twice. Resets the clock per page.
}
function expriedTime(){//True if time has expired; false otherwise.
 return time() > $_SESSION['~TC:Time'];
}

[Lamez]

Okay, so I printed out the timestamps. I am doing something wrong:

 

Here is time(): 1272660826

Here is $_SESSION['~TC:Time']: 1.6926659444736E+30

I got that large number after I refreshed the page a couple times. Any suggestions?

[Lamez]

I revised my functions like so:

function startTime($min){ //Starts the time clock (TC), should only be used in the loginAdmin and updateTime functions.
$min *= 60;
if(!isset($_SESSION['~TC:Min']) || $_SESSION['~TC:Min'] != $min)
	$_SESSION['~TC:Min'] = $min;
//$_SESSION['~TC:Time'] = time() + $_SESSION['~TC:Min'];
updateTime();
}
function updateTime(){
//startTime($_SESSION['~TC:Min']); //No need to do the same thing twice. Resets the clock per page.
$_SESSION['~TC:Time'] = time() + $_SESSION['~TC:Min'];
}
function expiredTime(){//True if time has expired; false otherwise.
 return time() > $_SESSION['~TC:Time'];
}

 

Then I forgot to refresh the page, so it works great now!