CAPTCHA: problem incorporating the script into the webpage.

**andkhl** · 06-03-2008, 01:10 PM

This fully working script does not work when incorporated into a page. I have tried the following: a) put it into a function (function captcha()) and then called that function; b) created a separate page just for the 'captcha' script, and the included that page with the 'include' function. The result is always the same: The image (.... path ...) cannot be displayed, because it contains errors. This is so frustrating! As I said, the script DOES work on its own. Take a look:

PHP Code:


ob_start(); 

$image = imagecreate(80,30);

$bg_color = imagecolorallocate($image,102,102,102);

     

// ----------------- text -------------------------

$letters = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");

$numbers = array(1,2,3,4,5,6,7,8,9,0);

$joined = array_merge($letters, $numbers);

$word = "";

 for($i=0;$i<5;$i++) {

    $ran_pos = array_rand($joined); 

    $word .= $joined[$ran_pos];

 }



$textColor = imagecolorallocate($image, 255,255,255);

imagestring($image, 5, 15, 5, $word, $textColor);

     

header('Content-type: image/png');

imagepng($image);

ob_flush();

If I put the script into a function

PHP Code:


function captcha() {

....

....

}

and then call it, it does work [U]as long as I do NOT call it from within any HTML tags, like this:

HTML Code:

<body>
   <?php captcha(); ?>
</body>

I don't know what to do. Please help. (I wasn't been able to find a solution in Google or anywhere else).

**Phill Pafford** · 06-03-2008, 01:58 PM

Try this:

file name: captcha.php

PHP Code:


class Captcha

{

    function getCaptcha()

    {

        ob_start();

        

        $image = imagecreate(80,30);

        $bg_color = imagecolorallocate($image,102,102,102);

    

        // ----------------- text -------------------------

        $letters = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");

        $numbers = array(1,2,3,4,5,6,7,8,9,0);

        $joined = array_merge($letters, $numbers);

        $word = "";

        

        for($i=0;$i<5;$i++) 

        {

            $ran_pos = array_rand($joined);

            $word .= $joined[$ran_pos];

        }



        $textColor = imagecolorallocate($image, 255,255,255);

        imagestring($image, 5, 15, 5, $word, $textColor);

    

        header('Content-type: image/png');

        imagepng($image);

        

        ob_flush();    

    }

};



$captcha = new Captcha;

$captcha->getCaptcha();

web page name: page.php

HTML Code:

<?php

include('captcha.php');

?>

<img src="<?php $captcha ?>">

**andkhl** · 06-03-2008, 03:29 PM

Thanks for your reply!!! Unfortunately, I got the very same error I had getting earlier. BUT, your script gave me an idea that solved the problem.

Instead of doing this:

HTML Code:

<img src="<?php include(.....); ?>" />

I did it with no PHP tags:

HTML Code:

<img src="captcha.php" />

CAPTCHA works now. A minor problem is, though, for some reason I can't set the SESSION key initially, when the page first loads. Of course, after I refresh the page, the SESSION key is there, but not the first time around.

Like this :

PHP Code:


....

....

 $textColor = imagecolorallocate($image, 255,255,255);

 imagestring($image, 5, 15, 5, $word, $textColor);

 $_SESSION['captcha_key'] = sha1($word);

....

.....

When the page loads, the following script 'complains' that such SESSION does not exist.

PHP Code:


echo $_SESSION['captcha_key']

NOTE: session_start() exist on both pages (captcha.php and login.php).

It should work, but it doesn't. Would you be willing to help me with this? Thanks.

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