php add captcha

I work for a small company and we haven't had any problems but I plan to add a captch.

How is this done?
burnedfacelessAsked:
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COBOLdinosaurConnect With a Mentor Commented:
While captcha might be a solution; the question is why use it if you do not have a problem?

Using captcha makes the site more difficult to use.  So it becomes a balancing issue.  If adding it to the site reduces the usability, it might cost you traffic.  It is only effective against automated spamming, and more and more spammers are using underpaid workers in 3rd word countries to post spam... catcha will not stop them.

Cd&
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artsecCommented:
I strongly recommend RECAPTCHA http://www.google.com/recaptcha/captcha it is well documented and secure.
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duncanb7Commented:
That is another alternative and its example

http://captcha.com/php-captcha.html?gclid=CJiOrrXCiLsCFUyt4godjhsAbQ
http://captcha.com/captcha-examples.html

Hope understand your question completely, if not please point it out

Duncan
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