In this chapter, we have discussed some advanced form usage capabilities.
Zend Framework 3 provides two classes whose purpose is enhancing form security:
Csrf. A CAPTCHA is a type of challenge-response test used to determine whether or
not the user is a human. CAPTCHA elements are used on form to prevent form submission by a
malicious automated process (a robot). The latter element,
Csrf, is used for Cross-Site
Request Forgery (abbreviated as CSRF) hacker attack prevention.
We have also learned of how to implement a multi-step forms with the help of sessions.