Implementing Captcha

janmejay

Hi,
I am getting lot of spams these days on my feedback form and want to implement Captcha. Tried few options but captcha did not work everytime.

Want to give a fresh try again - can anyone please suggest some good implementation of captcha with php code and html portion for it?

Thanks for your time and support on this

janmejay

NogDog

I've been using reCaptcha on my site, and so far have not gotten any bot-spam -- not that it would really be worth any bot's trouble, but that seldom seems to matter. :rolleyes:

janmejay

Thanks, NogDog for your reply. For reCaptcha - do they do verification on their server? I mean, everytime a visitor fills the feedback form, it goes to reCaptcha server for verification and then redirected to you if it is a valid visitor and not a bot spam, right? Is this understanding correct? And if so, then do we not loose control on our feedback form some way at least?

Your suggestions are highly appreciated as I am in real need of implementing some good and easy solution to fix this problem.

NogDog

Only the captcha text is referred to the recaptcha server; your form data stays between your web page form and your server-side form processing script. Here's a link to the PHP library for it: http://recaptcha.net/plugins/php/

janmejay

Thank you, NogDog... I always thought form data too goes to them.

two questions now - how easy/difficult is it to implement this reCaptcha. I would like to implement it in my feedback form.

Second question is - do you have a sample of feedback form html and its corresponding php code? I'll register on to this reCaptcha to get a Key to implement this.

Thanks for your replies. This looks like, this will help solve my bot spam problem.

janmejay

Hello NogDog,
Just saw your website and "Email Me" code you have given there with two scripts - The Form Page and Form-Handler script and a captcha image displayer script. Is this same as reCaptcha you mentioned in post reply? And how do you implement this in actual html web page?

I mean does the form page and form handler php along with captcha image displayer stays on server? And if so, what goes on in html page? Could you please throw more light on its actual implementation? With html wrappers example?

Thnx again for your support and time on this.
janmejay

NogDog

janmejay wrote:
Hello NogDog,
Just saw your website and "Email Me" code you have given there with two scripts - The Form Page and Form-Handler script and a captcha image displayer script. Is this same as reCaptcha you mentioned in post reply? And how do you implement this in actual html web page?

I mean does the form page and form handler php along with captcha image displayer stays on server? And if so, what goes on in html page? Could you please throw more light on its actual implementation? With html wrappers example?

Thnx again for your support and time on this.
janmejay

The captcha code is older code I wrote myself and used to use before I switched over to the recaptcha stuff.

All you need to do to use recaptcha is follow the 4 steps described on the PHP plugin page.

janmejay

OK, NOgDog, sounds good. One last question - if a visitor has not enabled his/her browser for javascript then will this captcha or reCaptha display properly?

NogDog

Yes, it has an alternative display for when JavaScript is not enabled.

janmejay

Cool! and this alternative display is part of reCaptcha downloads, right ? I mean, we don't have to do anything extra for that, right? 🙂

NogDog

Yes, I just tested it on my site after turning off JavaScript in my browser. (The Firefox Web Developer extension has many useful features. 🙂 )