Chapter 21. Network I/O

IN THIS CHAPTER

• DNS/Reverse DNS Lookups

• Socket Programming

• Network Helper Functions

In Chapter 20, "Working with the File System," I introduced the file system access functions, many of which allow you to access data from remote resources such as Web servers, FTP servers, and more. Although powerful, PHP offers many other tools to use when you're working with network connections. In this chapter, we'll introduce working with network technologies such as DNS records, sockets, and more.