I'm trying to Dynamically Generate a Session Index and Check if isset. When the page that checks if its set loads I get an Unidentified Index error. Is there a way I could Set it to 0 or 1 when a Visiter firsts visits the site but doesn't re-write that value on Page Load which it would do if I fired it on init in the Page.php?

Here is my Check Function in my PageType.php if it helps

function CodeCheck(){
		$arIndex= strtolower(str_rot13(str_ireplace(" ","",$this->Title)));
		if ($_SESSION[$arIndex] == strtolower($this->AccessCode)) {
			return true;
		}
		else
		{
			return false;
		}
	}

As you can see it checks $_SESSION[$arIndex] for a specific value, however if the User Hasn't visited this page its not set and I get the UnIdentified Index error. If I write something to it in the init() function it gets over written with each page load thereby erasing the Visitor submitted data.

Is there an existing $_SESSION array in the system that only gets written on the Visitors FIRST pageload?

Solved thanks to IRC

FYI in my init function I used

$sesCheck = Session::get($arIndex);
		if (isset($sesCheck)){
		}
		else
		{
			Session::addToArray($arIndex, 1);
		}

Using the Session Class instead of $_Session, and did all my checks against the Session Class.