Anyone using the CAPTCHA extension successfully?

The image won't show up for me.

Yes I have GD 2.0.28 installed.

Further, when I try to load the missing image...
Fatal error: Call to undefined function:
imageftbbox() in /forum/extensions/CAPTCHA/library/php-captcha.inc.php on line 296

You need the GD library configured in PHP I believe. You may want to check that.

I have installed the CAPTCHA extension in a brand new Vanilla 1 installation, in a server which - like Wanderer's - seems to fulfill the requirements. I, too, am experiencing exactly the same problem. My server gives me a more precise error description, stating that the problem was that the "imageftbbox" function (used in "php-captcha.inc.php") is undefined.

I honestly hope the developer can solve this!

Last of all, one request: as well as showing the captcha image, it would be nice if we could also show a little message (for instance, "If you have problems viewing this image, please contact the Forum Adminstrator"), with a link to the administrator's address, for people with visual difficulties.

Many thanks, and KEEP UP THE GOOD WORK!

And there was me thinking the whole point of standards compliant websites was to make it easier for text readers...

@Wanderer: people with visual difficulties often use software that can read the screen text to them - so text with a link to the administrator would be good for this audience.

@Dinoboff: the output of phpinfo() tells me that the version is 4.3.11. GD support is enabled, and the GD version is "bundled (2.0.28 compatible)". Does that help? - let me know if there is any more info I can give you!

Dinoboff, my phpinfo() tells me...

PHP Version 4.3.10
GD Support enabled
GD Version bundled (2.0.28 compatible)

About CAPTCHA, I wonder what you guys think about this. It seems to work, and it's really cute :)

It's currently quite a buggy version, sometimes you'll need to hit submit several times before the pictures are actually displayed. What I've posted above is close to Pix from your link.

Sorry, Have been quite busy the last few weeks. I will try to work on it this week

@Dinoboff: thank you very much for looking into it!

I downloaded, installed and enabled the extension - oh, by the way: the "readme" file in the package is actually the readme for the "Applicant Email Verification" extension, not for the CAPTCHA!

Unfortunately, still getting the same error:

Fatal error: Call to undefined function: imagettfbbox()
in (~...)/public_html/forumoj/extensions/CAPTCHA/library/
php-captcha.inc.php on line 296

@Dinoboff: I've contacted my service provider, and you are right. Here is their response:

"I have verified it and this problem is due to freetype module missing. I will recompile php with freetype support in non peak hours and let you know shortly."

Maybe this might be something worthwhile documenting, somewhere in the 'requirements' for this add-on, in case other users have similar problems in the future!

PS: have you changed your "ReadMe" file? The one you had included in the download package was the wrong one! :)

@Dinoboff: just wanted to let you know that my ISP recompiled PHP with the FreeType libraries, and now CAPTCHA works like a charm! - Thank you, thank you, thank you!!!

Now, a little request: in the next version, would you be able to include also an (obfuscated) link to the administrator's email address? - this is very useful, as usually when the person trying to register has a visual disability, they use screen-reading software.

Once again, many, many,many thanks for the great work! :)

Just updated it. It support audio captcha (require Flite) allowing visualy impaired to register.

You can't use it with Application Email Verification 0.4.0 if you don't have audio Captcha enable.

The Captcha options should be added to registration setting page in the next version.

That'd be an awesome way to make sure your user group had a minimum level of intelligence. Take them through a small IQ test and disguise it as a captcha!

@Dinoboff: an audio captcha is useful, specially if your ISP has the required libraries. For those who don't, it would still be useful - as described in a previous posting - to be able to display an obfuscated link to the admin's email address, in case a person with visual impairments is trying to register, or some other problem is being experienced.

Minesweeper, i think that basic level of IQ is a prerequisite if they are planning to come online and read forums. :) if they can't do simple math, then i doubt they can figure out how a forum even works.

plus it can be something like this. without numbers

How many letters in the word "vanilla" = ?

it will be really hard for bots to figure out the question. A set of like 20 prewritten questions with random numbers or words is very effective. acvourse this assume english language proficiency, but thats a prerequisite for a english forum anyway.

Quite a bit more than a basic test, but the International High IQ Society is such a community.

I missed the mark by one point. No joke.

I know I could make it in if I retried, but its too expensive... on second thought, $79 is very cheap to put a fancy bit of bragging rights on a resume...

I'd feel a bit silly putting something like International High IQ Society or Mensa on my CV. I mean, it doesn't really say all that much about you, does it? Except that you managed to pass an IQ test, and don't mind paying an entry + annual fee.

You only need 124 for the High IQ Society? I feel so damn brainy now :D

After upgrading to Vanilla 1.1, I was notified that a new version of the CAPTCHA extension was available.

I downloaded it, as prompted, and installed it, only to be greeted by this error message when I try to access my settings.php page:


"A fatal, non-recoverable error has occurred
Technical information (for support personel):

Error Message
Could not Add the CaptchaDisableDescription field to the User table
Affected Elements
CAPTCHA Upgrader.undefined();

The error occurred on or near: Duplicate column name 'CaptchaDisableDescription'

For additional support documentation, visit the Lussumo Documentation website at: lussumo.com/docs"

Whatever this is, it needs to be corrected ASAP!

@Dinoboff: the version of CAPTCHA that I've just reinstalled, and seem to be running with no problems, is 0.1.3.

Am I supposed to do something special to upgrade from 0.1.x to 0.2.x?

@Dino: thank you for the feedback.

In conf/settings.php:

$Configuration['CAPTCHA_AUDIO_PATH'] = '/tmp/';
$Configuration['CAPTCHA_FLITE_PATH'] = 'NONE';

In my database, there is indeed a table named "LUM_User", which has a field named "CaptchaDisableDescription".

@Dinoboff: yes, you were right - in my conf/settings.php I had:

$Configuration['CAPTCHA_VERSION'] = '0.1'

Changing it manually to:

$Configuration['CAPTCHA_VERSION'] = '2.0'

then uploading the latest version (0.2.1a) worked fine! It is compatible with Vanilla 1.1.2!

Many thanks, and keep up the good work!

Got the entry in the DB, now the CAPTCHA doesn't show on the reg form....

Edit: I'm an noob. Didn't realize you had to turn it on next to enabling the extension.