That’s why I immediately add captcha to the comment system. Captcha is a sequence of text which is printed on an image to make sure that only human can read and interpret it.
To understand how to make it, please visit this site (Indonesian). If you’re looking for an english alternative, you can google it. Just type “captcha php”.
Let’s fight spammers to assure our readers that they are talking to a human, not something else!