PHP security questions and answers for expreienced

PHP Security Questions & Answers:

1. What is Best method for sanitizing user input with PHP?
2. Difference between Notice and warning and fatal error
3. How can I prevent SQL-injection in PHP [SOLVED]
4. PHP Register Globals
5. PHP Sessions and Cookie and Security
6. Free Boost Web Application By 20% in Simple Steps
7. PHP Check Mime Type of File - Return Information About A File
8. Crontab Interview Questions and Answers
9. Improve Ajax Performance
10. PHP Captcha Code Example Code Snippets
11. PHP - Secure Ajax Call from Hackers - Example
12. htaccess code snippets example
13. Manage Cron Job with PHP - SSH2 Connection
14. Shared Server Security Risk open_basedir disable_functions disable_classes
15. Spoofed Forms - Stop Spoofed Form Submissions
16. Session Fixation
17. Session Hijacking
18. openssl private encrypt
19. Cross Site Request Forgery
20. SQL Injection Attack - PHP & MySQL
21. Cross-Site Scripting
22. PHP INI settings