captcha help

[jl9148]

hey, i have a memberscript and when users register, i want them to enter in a captcha code.

the script already comes with that but its not working. below is the code...

verification.php

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

$im = imagecreate(12,16); 
$white = imagecolorallocate($im,255,255,255); 
$black = imagecolorallocate($im,0,0,0); 

$new_string = $_GET[code];
$new_string = substr($new_string,17,6); 
$new_string = $new_string[$_GET[p]];

imagefill($im,0,0,$black); 
imagestring($im,3,3,1,$new_string,$white); 
imagejpeg($im); 
imagedestroy($im); 
?>

and here is what i put into the registration page...

<fieldset>
<legend>Image Verification</legend>
<table cellpadding="0" cellspacing="0" class="main"><tr>
<?php
for ( $p = 0; $p <= 5; $p++ ) {
echo "<td><img src='$script_location/verification.php?code=$v&p=$p'></td>";
echo "<td width='5'></td>";
}
?>
<td><input type="text" name="verification" size="16" maxlength="6" class="form"></td>
</tr></table>
</fieldset>

whenever i try to do that, all that shows up is 5 black blocks..

help anyone? thanks

[ClarkF1]

Where is $v declared......passing the code to be used for the CAPTCHA image through a URL defeats the object.

This probably won't work because the link to the image isn't being passed to the browser (in the URL bar) and so the $_GET variables won't get sent to the script.

What you want is a script that'll produce a single image rather than five which is generated randomly and not based

The one here is simple to use.

You can read through the manual about how it works and then download the code and insert it into your code at the end.