PHP Session Variable Not Parsing But ISSET Says It Is Running & At 0
Solution 1:
Haven't seen your html but you might be missing something to start and run the timer function - this might be missing:
<body onload="intTimer = setInterval(function(){ countUP() }, 1000);">
Also I am not quite clear how you are submitting the page but I can't see anything that passes the value of the timer to the session variable. If you put a form on your page with a submit button then you could pick up the value of a hidden input with its value being set with javascript. You could submit the page automatically using submit(); in your javascript when the counter reaches a certain number if you want that:
page1.html (could be called page1,php but there is no php in page 1 so that is not actually necessary)
<!DOCTYPE html>
<html>
<head>
<title>Page 1</title>
<script language="javascript">
var intTimer = '';
var counter = 0;
function countUP(){
counter++; //increment the counter by 1
//display the new value in the div
document.getElementById("timer_container").innerHTML = "Session Time Counter: " + counter;
document.getElementById("tim_val").value = counter;
}
</script>
</head>
<body onload="intTimer = setInterval(function(){ countUP() }, 1000);">
<form name="form" id="form" action="page2.php" method="post">
<input type="hidden" id="tim_val" name="tim_val" value="" />
<input type="submit" name="submit"/>
</form>
<div id="timer_container">Session Time Counter: 0</div>
</body>
</html>
You aren't referencing $_SESSION["counter"] on page 1 and you are initialising to 0 not 100 in your JavaScript.
In your page 2 script page2.php you would have this - you could also submit this page to itself if only a part of the content is to be changed but the timer needs to continue or be logged at the point of submission.
<?php session_start();?>
<!DOCTYPE html>
<html>
<head>
<title>Page 2</title>
<?php
if(!isset($_SESSION["counter"])){
//if not, initiate this variable with 100
$_SESSION["counter"] = 100;
}else{
// give it the posted value
$_SESSION["counter"] = (int) $_POST['tim_val'];
}
?>
<script language="javascript">
clearInterval(intTimer);
var intTimer = '';
var counter = <?php echo $_SESSION["counter"]; ?>;
function countUP(){
counter++; //increment the counter by 1
//display the new value in the div
document.getElementById("timer_container").innerHTML = "Session Time Counter: " + counter;
document.getElementById("tim_val").value = counter;
}
</script>
</head>
<body onload="intTimer = setInterval(function(){ countUP() }, 1000);">
<form name="form" id="form" action="page2.php" method="post">
<input type="hidden" id="tim_val" name="tim_val" value="<?php echo $_SESSION["counter"]; ?>" />
<input type="submit" name="submit"/>
</form>
<div id="timer_container">Session Time Counter: <?php echo $_SESSION["counter"]; ?></div>
</body>
</html>
And in your page2.php JavaScript you would need to clearInterval() and restart it. http://www.w3schools.com/jsref/met_win_clearinterval.asp
var counter=<?php echo intval($_SESSION["counter"]);?>; //initiates score to submitted value
You probably won't need to use a session variable as you are using the hidden input, so you could use:
var counter=<?php echo intval($_POST["counter"]);?>; //initiates score
You could also add 1 to it to approximately account for the delay submitting it
var counter = <?php echo $_SESSION["counter"] + 1; ?>;
var counter=<?php echo intval($_POST["tim_val"] + 1);?>; //initiates score
You could stick with using GET but I just prefer POST.
This has a bit more about hidden inputs: Get and echo inputs from textarea repeatedly
and a bit more about the timer script: http://www.w3schools.com/js/tryit.asp?filename=tryjs_timing_clock
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