I need answers for the follwing questions

PHP Questions 1. Explain about session management and cookies ? In PHP how we can maintain a session 2. What is HTTP tunneling 3. How to enable PHP in Apache server manually? 4. When we upload a file using <INPUT> tag of the type FILE what are global variables become available for use in PHP 5. Explain SQL injections ? How we can avoid this 6. Write a small script to connect a MYSQL server in PHP 7. Given a class B network with subnet mask of 255.255.248.0 and a packet addressed to 130.40.32.16 whatis subnet address 8. Using single Apache server can we host multiple sites . If yes how can we do this if no why it is not possible 9. what is search engine optimization ? In HTML using which tag we can attain this? 10. Write a function in PHP script to check whether string is a valid email id or not? _________________________________________________________________ Garfield on your mobile. Download now. http://server1.msn.co.in/sp03/gprs/ How cool can life get?