Advnace a cookie value by one. Wut?

PHP
1

I’m trying to set up a cookie that, for each visit to a page, counts to 12, and then starts over at one again.



 // if there is no cookie, set one or if it's greater than 12, set it back to one since there's only 12 images
 if(!isset($_COOKIE['c_idximg']) || ($_COOKIE['c_idximg'] > 12)) { 
     setcookie("c_idximg",1, time()+86400*7); }
 else {
      // next page visit, it already exist, so advance it by one
	    $imgNUM = $_COOKIE['c_idximg'];
        $imgNUM = $imgNUM + 1; // advance by one
        setcookie("c_idximg",$imgNUM, time()+86400*7); 
  }

// output the values to see what they are!!
   echo $imgNUM.' this is imgNUM<br>';
   echo $_COOKIE["c_idximg"].' this is the cookie'; // this is ONE MORE than "imgNUM". WTH??

What’s freaking me out here, when I output the two values as above:

  1. “$imgNUM” is always one value higher than the cookie value.
  2. The cookie will count to 13 before resetting to one.

Uhhh, I’m probably an idiot, but what’s going on there that I don’t get?

edit: obviously I have no idea how to spell “Advnace” …

2

Found another way to do it. Still puzzled by the first attempt above though.
This works:


 $idxIMG = 1;
 if (isset($_COOKIE["idxIMG"])) {
    $idxIMG = (int)$_COOKIE["idxIMG"];
	   if($idxIMG > 12){
		   $idxIMG = 1;
		   setcookie("idxIMG", 1, time() + (60 * 60 * 24 * 30)); 
	   }
 }		
 setcookie("idxIMG", $idxIMG + 1, time() + (60 * 60 * 24 * 30));