Image Verification

Phoenix_Down

I can't seem to get this to work. Even if I type in the correct string, I still get the error. Here is my code:

        include 'lib/config.php';

    connect();

    session_start();

    $RandomStr = md5(microtime());

    $ResultStr = substr($RandomStr,0,5);

    $NewImage =imagecreatefromjpeg("lib/images/img.jpg");

    $LineColor = imagecolorallocate($NewImage,233,239,239);
    $TextColor = imagecolorallocate($NewImage, 255, 255, 255);

    imageline($NewImage,1,1,40,40,$LineColor);
    imageline($NewImage,1,100,60,0,$LineColor);

    imagestring($NewImage, 5, 20, 10, $ResultStr, $TextColor);

    $_SESSION['key'] = $ResultStr;

    $key=substr($_SESSION['key'],0,5);
    if($number != $key) {
            Message("Image Verification Failed", "The characters that you have entered do not match. Please try again.");
    }

My form code is:

<img src=\"captcha.php\"> <input  type=\"text\" name=\"number\" size=\"5\">

Please help me.

roscor

have you set the header?

header ("Content-type: image/jpeg");

Weedpacket

Where does $number come from, and how is it expected to magically contain a string that you just randomly generated?
If you want to compare it with what was stored in the session by a previous page, you ought to check that before overwriting the session value with a new random string.

halojoy

make 2-3 pages

create an image
store expected number value in SESSION
display image + form
process, evaluate submitted number
and do some actions based on result

page #2 could make an include of page #1

🙂