Core PHP Programming, Third Edition

Chapter 7. I/O and Disk Access

Topics in This Chapter

• HTTP Connections

• Writing to the Browser

• Output Buffering

• Environment Variables

• Getting Input from Forms

• Passing Arrays in Forms

• Cookies

• File Uploads

• Reading and Writing to Files

• Sessions

• The include and require Functions

• Don't Trust User Input

Ultimately, in order to be useful, a script must communicate with the outside world. We've seen PHP scripts that send text to the browser and get some information from functions like date. In this chapter we examine all the ways a PHP script can exchange data without using special interfaces. This includes reading from local disk drives, connecting to remote machines on the Internet, and receiving form input.

PHP is similar to other programming environments—with ...