title: Is there any alternative to captcha?
body: <p>I use capcha in user registration form devloped in PHP. But I found that users are struggling to get the words right the first time and they think it is very long and boring process. I want to keep my registration form as simple as possible. hence I want to remove this capcha from my site. But we knows some time its possible that any intruder will try to insert bulk data in user registration step. to restrict it we need the captcha. So the my question is, is there an alternative to captcha?</p>
  
  <p><strong>Thanks in advance.</strong></p>