Random Verification Image

[daredevil14]

Greetings,

i've been working on a random verification image the past days, i am facing a really weird problem, here's my code and i will explain below...

<?php

// register.php

if ( !isset($_POST["submit"]) )
  {
  include("image.php");
  ?>
  <form method="post" action="register.php">
  <input type="text" name="sa">
  <input type="submit" name="submit">
  </form>
  <?php
  }
  else
  {
  if ( $_POST["sa"] == $sal )
    {
    echo "Your Verification Number ". "<b>".$sal."</b>" . " Was Correct";
    }
    else
    {
    echo "Doesn't Match!!";
    }
  }

?>

and the content of image.php is :

<?php

function salt()
  {
  $sal = "";
  for ( $i = 0; $i < 6; $i++ )
    {
    $sal .= rand(1,9);
    }
  return $sal;
  }

$sal = salt();

header("Content-type: image/gif");
$img = ImageCreate(48,20);

$red = ImageColorAllocate($img, 255, 0, 0); 
$white = ImageColorAllocate($img, 255, 255, 255); 

ImageString($img, 3, 3, 3, $sal, $white);
ImageGif($img);

ImageDestroy($img);

?>

The problem is simple, after the output of the random image ( which works perfectly ), the script just stop its execution, it is like writing "exit;" after the print of the image , any idea on why is that happening ?
And if i remove the HTML form, and place instead of it any other element, it works, so it is like no HTML forms are allowed in the same page as a GD generated image... so ?

However, I created a text-based one ( and not image ) and it is working perfectly...

Regards

[Joseph07]

Change your register.php from your original to

<?php session_start();

// register.php

if ( !isset($_POST["submit"]) )
  {

  ?><img src="image.php">
  <form method="post" action="register2.php">
  <input type="text" name="sa">
  <input type="submit" name="submit">
  </form>
  <?php
  }
  else
  {
  if ( $_POST["sa"] = $_SESSION['sal'] )
    {
    echo "Your Verification Number ". "<b>".$_SESSION['sal']."</b>" . " Was Correct";
    }
    else
    {
    echo "Doesn't Match!!";
    }
  }

?> 

And your image.php to

<?php session_start();

function salt()
  {
  $sal = "";
  for ( $i = 0; $i < 6; $i++ )
    {
    $sal .= rand(1,9);
    }
  return $sal;
  }

$_SESSION['sal'] = $sal = salt();

header("Content-type: image/gif");
$img = ImageCreate(48,20);

$red = ImageColorAllocate($img, 255, 0, 0);
$white = ImageColorAllocate($img, 255, 255, 255);

ImageString($img, 3, 3, 3, $sal, $white);
ImageGif($img);

ImageDestroy($img);

?> 

One of all, the script ends at the place where you create the image.
Secondly, your $sal variable will not be able to pass through 3 pages, thus when you submit the form, the $sal does not mean anything or contains anything.

You have to change to using session to store the $sal.

[daredevil14]

yeah ok thanks i did this, but now i wanna output the image.php "image" to the register.php page, i am trying to do so by :

<iframe src="image.php" width="10%" height="15%"></iframe>

i am doing so because i wanna generate the session image value when registering and i am framing it because it can't be printed directly from image.php( by including it or any other way... ) so is it good to frame image.php ? and if it is, how do i let the frame width & height be "exactly" the same as the image and not the existence of blank areas...

[daredevil14]

ok i just solved the problem of the appearence of the frame... now my simple question, is it good to frame image.php ?

[Joseph07]

Why is it that you want to use frame for it? Any specific reason behind it?