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== See also == |
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Revision as of 14:59, 13 July 2003
The computer language PHP (originally "Personal Home Page", but now a recursive acronym for "PHP Hypertext Preprocessor") is a widely used open-source programming language used primarily for server-side applications, to develop dynamic web content such as the Wikipedia software. It can be seen as an open source alternative to Microsoft's Active Server Pages (ASP) system and to the similar CGI/Perl system.
Its ease of use and similarity with the most common structured programming languages, most notably C, Java and Perl, allows most experienced programmers to start developing complex applications with a minimal learning curve. It also enables experienced developers to get involved with dynamic web content applications without having to learn a whole new set of functions and practices.
One of the more attractive parts of PHP is that it is not only a scripting language. Because it has been designed from the start to be modular, the PHP core system has been used to develop desktop applications that are close to the same performance as traditional C++ compiled applications, and it can be used from the command line just as Perl or Python may.
PHP allows, among other things, easy interaction with a very large number of relational database systems (Oracle, DB2, MySQL, PostgreSQL, etc.), while maintaining a simple and straightforward syntax. PHP runs on every major operating system, including Unix, Linux, Windows, and Mac OS X and can interact with all major web servers. The PHP website (php.net) has some of the best documentation pages of any project, and a good deal of help with setting up PHP on obscure operating systems and web-servers. The Linux, Apache, MySql, PHP (LAMP) architecture has become very popular in the industry for deploying reliable, scalable and secure web applications.
PHP is the result of the collective efforts of many contributors. It is licensed under a BSD-style license, the PHP license.
PHP's Libraries
PHP, unlike ASP and Perl, has some of the largest free and open-source libaries included with the core build. PHP is a fundamentally internet-aware system and as such there are modules built in for accessing FTP servers, all manners of database servers, LDAP servers and much more. In addition to this, the most used functions such as printf() and strstr() from C and other generic functions such as str_replace(), preg_match() are all available in the core of PHP.
PHP has a wide variety of extensions such as support for the Windows API, process management on Linux, cURL support, ZIP and GZip support. Some of the more unique features are PDF generation, Shockwave Flash generation (on the fly), integration with IRC and much more besides.
History
PHP was originally designed as a wrapper around Perl by Rasmus Lerdorf in 1994 to display his resume information, and collect some data, such as how many hits it was generating. Others first used "Personal Home Page Tools" in 1995, which Lerdorf had combined with his own Form Interpreter to create PHP/FI. Zeev Suraski and Andi Gutmans rewrote the parser in 1997, forming the basis of PHP 3. They also changed the name to its current recursive form. After months in beta, the development team officially released PHP/FI 2 in November 1997. Public testing of PHP 3 began immediately and the official launch came in June 1998. Suraski and Gutmans started a new rewrite of PHP's core, producing the Zend engine in 1999. In May 2000, PHP 4 powered by the Zend Engine was released. Development continues toward PHP 5 with Zend Engine 2.
Popularity of PHP
PHP is one of the most popular server-side scripting systems on the Web. It's been widely adopted since the release of version 4, which was the first version powered by the powerful Zend Engine from Zend Technologies.
According to Netcraft's April 2002 survey, PHP is now the most-deployed server-side scripting language, running on around 9 million of the 37 million domains in their survey. This is confirmed by PHP.net's own figures, which show PHP usage measured on a per-domain basis growing at around 5% per month. In May 2003, almost 13 million domains were using PHP, based on the same source.
However, PHP is not the most commonly used tool if measurements are made on a per-page basis. Another estimate in March 2002, based on searching for Web pages by their suffix, places PHP in second place at 30% of measured pages, behind 48% using Microsoft's ASP, but also shows PHP growing rapidly in market share. However, this method is notoriously inaccurate for measuring PHP popularity as some PHP systems dispense with the file names, using only directories, while other sites tend to dispense with the .php extension.
Due to PHP's popularity, a new breed of programmers has emerged who are only familiar with PHP, which in turn forced open the door towards a command line interface for PHP, along with support for GUI functions, such as Gtk support. This is a major step for PHP, because it represents its adoption as a genuine programming language (i.e. running autonomously on a stand-alone machine, as opposed to its original purpose of serving web pages to client machines from a server).
See also
External Links
- You can find information about PHP on the home page at http://www.php.net/
- Newsforge report of Netcraft web host survey
- PHP.net domain-based graph of PHP deployment
- PHPBuilder is an online resource for PHP developers
- Webmonkey has an excellent beginner's PHP tutorial.