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Chances are that if you’ve been around the Internet long enough, you’ve heard
of server-side scripting languages such as PERL, ASP and ColdFusion. These are
all popular languages that are used to add interactivity to Web sites, but one
stands out from the crowd in terms of usability, power, and, yes, price: the PHP
scripting language. Initially developed in 1995 by North Carolina programmer
Rasmus Lerdorf, PHP has since blossomed into one of the leading open-source,
cross-platform scripting languages available. This is due, in large part, to the
worldwide community of coders that contributes to its development. Unlike
proprietary scripting languages like ASP and ColdFusion, PHP’s source code is
freely available for peer review and contributions. This is, of course, the
essence of open-source software development, but why is it that PHP in
particular has gained such popularity among Web developers when there are other
open-source alternatives, such as good old-fashioned PERL CGI scripts?
One very strong reason is that PHP, unlike PERL CGI scripts, is scalable and
fast. Instead of requiring the server to start a new process in the operating
system’s kernel for each new request, which uses both CPU time and memory, PHP
can run as a part of the Web server itself, which saves a considerable amount of
processing time when dealing with multiple requests. This decreased processing
time means that PHP can be used for high-traffic sites that cannot afford to
have their performance hampered by relatively slow CGI scripts.
In addition to its scalability and speed, another usability factor that sets PHP
apart is its ease of use. The PHP language is considered to be a mix between C
and PERL, and it draws from the best features of each parent language, while
adding unique features of its own. For example, PHP code can be embedded within
standard HTML documents without using additional print statements or calling
separate scripts to perform the processing tasks. In practice, this allows for
very flexible programming practices. Although a working knowledge of HTML is a
prerequisite for PHP development, PHP’s basic functions can be learned quickly
and applied to a wide range of common Webmaster-related projects, such as order
forms, e-mail responses, and interactive Web pages.
Contributing to the power of the PHP language, is its native support for leading
relational database platforms, including MySQL, Oracle and PostgreSQL.
Platform-specific functions are built into the language for 12 databases in all.
This native support for database platforms is a boon to any site that needs to
track user information, store product data, or collect sales information.
Last but not least, because PHP is open-source, it is essentially free to use.
Almost all professional Unix-based Web hosts offer PHP as an included option
with hosting accounts. Be sure to check with your host to see if it is available
to you.
This article is meant to be an introduction to the PHP language and not a
tutorial, but have no fear—here are several first-rate sites that have articles
that will guide you along in beginning your PHP development projects:
www.php.net
www.onlamp.com/php/
www.phpbuilder.com
About the Author
Alan is the lead developer for InfoServe Media, LLC (http://www.infoservemedia.com),
a Web development company that specializes in Web site design, hosting, domain
name registration, and promotion for small businesses.
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