PHP Interview Questions -1

1. If you have to work with dates in the following format: "Tuesday, February 14, 2006 @ 10:39 am", how can you convert them to another format, that is easier to use?
2. How can I maintain the count of how many persons have hit my site?
3. How i can get ip address
4. what is difference between mysql_fetch_array(),mysql_fetch_row() and mysql_fetch_object() please insert with example
5. what is differenc between mysql_connect and mysql_pconnect
6. How we know browser properties
7. How i will check that user is, logged in or not. i want to make it a function and i want to use in each page and after login i want to go in current page(same page. where i was working)
8. How can I maintain the count of how many persons have hit my site?
9. How i can make a chat page in php in simple
10. What is the difference between echo and print statement?What is difference between require_once(), require(), include(). Becouse above three function usely use to call a file in another file.