Summary
Transferring files via the Web eliminates a great many inconveniences otherwise
posed by firewalls and FTP servers and clients. It also enhances an application??™s ability
to easily manipulate and publish nontraditional files. In this chapter, you learned just
how easy it is to add such capabilities to your PHP applications. In addition to offering a
comprehensive overview of PHP??™s file-upload features, several practical examples
were discussed.
The next chapter introduces in great detail the highly useful Web development
topic of tracking users via session handling.
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C H A P T E R 1 6
Networking
You may have turned to this chapter wondering just what PHP could possibly have
to offer in regard to networking. After all, aren??™t networking tasks largely relegated to
languages commonly used for system administration, such as Perl or Python? While
such a stereotype might have once painted a fairly accurate picture, these days, incorporating
networking capabilities into a Web application is commonplace. In fact, Webbased
applications are regularly used to monitor and even maintain network infrastructures.
Furthermore, with the introduction of the command-line interface (CLI)
in PHP version 4.2.0, PHP is now increasingly used for system administration among
developers who wish to continue using their favorite language for other purposes.
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