Comments on: Captcha – in 5 lines of php :)

By: Sithum

Sithum — Wed, 09 Sep 2009 17:30:00 +0000

Hi,
Your class is great!. I tried to integrate this to my page. But i couldn’t.

Error :

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\dbtest\captcha.php:209) in C:\xampp\htdocs\dbtest\captcha.php on line 160

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\dbtest\captcha.php:209) in C:\xampp\htdocs\dbtest\captcha.php on line 79
Unable to set the cookie – Cookies must be enabled to use this form.

Please help.
Thanks.

By: rune

rune — Wed, 08 Apr 2009 13:05:32 +0000

picture not showing. everything else works. my path is wrong? help pls

By: Eren Kesdi

Eren Kesdi — Mon, 23 Mar 2009 16:15:52 +0000

Warning: imagepng() [function.imagepng]: gd-png: fatal libpng error: zlib error in /home/.fuse/sebstence/olympics.theletterate.com/captcha.class.php on line 123

Warning: imagepng() [function.imagepng]: gd-png error: setjmp returns error condition in /home/.fuse/sebstence/olympics.theletterate.com/captcha.class.php on line 123
__________________________________________
Answer :
Fix it easily by changing your compression variable of imagepng, imagegif or imagejpg/imagejpeg into a 1-10 ranged number – instead of the PHP 4 1-100 standard.

find
$saveImage = imagepng($image, $imageFilename, 100);

replace
$saveImage = imagepng($image, $imageFilename, 5);

By: Ryan

Ryan — Mon, 05 Jan 2009 15:53:39 +0000

i have a problem, the captcha work ok on mozilla, but in Internet explorer 6.0 is never validates….

i mean, on IE6 $verify=0 ….

somebody know why??????

help!!!

By: blabub

blabub — Wed, 09 Jul 2008 11:48:14 +0000

Who ever write this lib, learn one thing.
Never, never, never delete the content of a directory when you have no idea what can be in this directory!
In this example the imagedirectory, you wiped my whole htdocs with that shit.
It\’s so hard to check if there are other files in the temp dir?

Long lives backupping!

By: Sangeeta

Sangeeta — Sat, 17 May 2008 05:13:36 +0000

can you help out with this error which I got after adding the code:

Warning: opendir(/path/to/your/captchaImages/directory) [function.opendir]: failed to open dir: Invalid argument in C:\Program Files\xampp\htdocs\Clients\captchatest\captcha.class.php on line 161

Warning: imagepng() [function.imagepng]: Unable to open ‘/path/to/your/captchaImages/directory/CAPTCHA_1211001275_20_2456.png’ for writing in C:\Program Files\xampp\htdocs\Clients\captchatest\captcha.class.php on line 123
There was an error generating the Captcha – Check your directory path and permissions.

By: sebben

sebben — Mon, 24 Mar 2008 12:32:13 +0000

I’m getting this error
Warning: imagepng() [function.imagepng]: gd-png: fatal libpng error: zlib error in /home/.fuse/sebstence/olympics.theletterate.com/captcha.class.php on line 123

Warning: imagepng() [function.imagepng]: gd-png error: setjmp returns error condition in /home/.fuse/sebstence/olympics.theletterate.com/captcha.class.php on line 123

I have GD installed… am I missing something?
If you would like to have a look.
http://olympics.theletterate.com/upload.php
thanks for your help.

By: Niyaz PK

Niyaz PK — Wed, 24 Oct 2007 09:21:08 +0000

You cannot use CAPTCHA also too reliably.
Read my article

By: Moo

Moo — Thu, 11 Oct 2007 19:43:55 +0000

I can spot a few bad things in the code:

- colors are static
- string is positioned in a horizontal line
- word is stored in a cookie which is client-side

Nice try, but not safe.

By: Duncan

Duncan — Thu, 04 Oct 2007 03:02:09 +0000

This is a great tool. I’ve got it working perfectly but it runs into problems verifying the input. I suspect its because the form is posting to itself – if it finds a form field it validates the data using an external PHP file. If there are no problems it redirects to the script that adds it to the database. How would I implement this captcha using this system?
Thanks in advance