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

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

By: Gavin

Gavin — Wed, 26 Sep 2007 01:00:37 +0000

Sorry but this isn’t a captcha in 5 lines of code. It’s 5 lines to invoke it, but there’s an entire include file in the background. So

a) it’s not ‘a captcha in 5 lines’. To claim this is wrong.

b) this type of captcha, with an included class that’s invoked with just a few lines has been done many many times. I mean really - welcome to any function/class created in the last 10 years.

Your claim is like someone saying ‘an entire encyclopedia in two lines!’
include(’encyclopedia.php’); // a million lines of code.
echo $encyclopedia_data;

By: Jamie

Jamie — Sun, 23 Sep 2007 09:55:11 +0000

In Response to Octanes post on Digg.
When i said that it was 5 lines of code, this was meant as what the user would have to add to their code.

Nobody would be stupid enough to think that you could create a CAPTCHA in5 lines, that just dumb.

By: Jamie

Jamie — Sun, 23 Sep 2007 09:30:34 +0000

I should mention that you MUST have GD Enabled on your web-server PHP implementation.
This is usually implemented but if you cannot see the image and you cant see the problem, check that one

Jamie.