Exercises

1. What is the reason that register_globals is disabled by default in PHP?

2. Which of the following superglobals are not contained inside of $_REQUEST:

   • a) $_GET

   • b) $_COOKIES

   • c) $_FILES

   • d) $_POST

3. Give one advantage of using POST to send form data, and one advantage of using GET.

4. Why is the is_numeric() function a better choice for form validation than the is_int() function?

5. Which PHP function will automatically strip any HTML tags out of a variable?

6. Why might the CTYPE functions be the preferred method for data validation?

7. Client-side validation should be avoided at all times: true or false?

Copyright ©2015 Paul Hudson. Follow me: @twostraws.