How to crack a captcha

I need to crack a captcha but im completely stuck.
Heres the url : http://zanuaire.com/annuaire/antibot.php

I tried to search for an ocr class but they are all outdated. Can you give me some hints please it will be greatly appreciated.

You might be on your own here bud. Here is a great link though with plenty of articles so you can begin the journey on rolling your own for that site...

hoop://ha dot ckers dot org/blog/20070822/good-articles-on-captchas/

You can buy captcha from decaptcher, they provide php api too

That one is very easy to break..

Call Imagemagick (Imagick) methods from your PHP script to make it black and white. Make the background white and the letters black. (Grayscale and then play with the contrast)
Then have your script run the black and white image through GOCR with exec().

With a simple captcha like that one this process will work 100% of the time.