Sams Teach Yourself PHP in 24 Hours, Third Edition

Workshop

Quiz

1:	Which server variable might give you the URL of the referring page?
2:	Why can you not rely on the $_SERVER['REMOTE_ADDR'] variable to track an individual user across multiple visits to your script?
3:	What does HTTP stand for?
4:	Which client header line tells the server about the browser that is making the request?
5:	What does the server response code 404 mean?
6:	Without making your own network connection, which function might you use to access a Web page on a remote server?
7:	Given an IP address, which function could you use to get a hostname?
8:	Which function would you use to make a network connection?
9:	Which PHP function would you use to send an email?

Answers

A1:	You can often find the URL of the referring page ...