My site has always been targeted by spams for some reason. I want to write a code to prevent this. I know some people use captchas. but I would prefer to know the idea or concept to against the spams.
How entering numbers or answering questions can help us to stop the spams - I still don't get it yet...?
for instance, how answering the questions below can do the magic?
'What is 3 times nine?'
'What number is half a dozen?'
It would be great if you can give me some hint to make this code from scratch...
otherwise, any other programmes like captchas?