Hello,
I have a simple image verification script thats creates the image and stores the number into a session variable... however when I go to process the form and compare the verification number entered into the form to the one stored in the session I end up with 2 different numbers.. and from what Ive noticed by several tests is that the value stored in the session is a previous value... meaning the form is always comparing the form input to the previously stored session variable not the current.. any ideas???
session_start();
$alphanum = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
// generate 5 digit random number
//$rand = rand(10000, 99999);
$rand = substr(str_shuffle($alphanum), 0, 5);
// create the hash for the random number and put it in the session
$_SESSION['image_random_value'] = md5($rand);
// create the image
//$image = imagecreate(60, 30);
$image = imagecreatefromjpeg("verificationBG.jpg");
// use white as the background image
$bgColor = imagecolorallocate ($image, 255, 255, 255);
// the text color is black
$textColor = imagecolorallocate ($image, 0, 0, 0);
// write the random number
imagestring ($image, 5, 5, 8, $rand, $textColor);
// send several headers to make sure the image is not cached
// taken directly from the PHP Manual
// Date in the past
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
// always modified
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
// HTTP/1.1
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
// HTTP/1.0
header("Pragma: no-cache");
// send the content type header so the image is displayed properly
header('Content-type: image/jpeg');
// send the image to the browser
imagejpeg($image);
// destroy the image to free up the memory
imagedestroy($image);
