PHP: Hypertext Preprocessor (or simply PHP
) is a general-purpose programming language originally designed for web development. It was originally created by Rasmus Lerdorf
in 1994
; the PHP
reference implementation is now produced by The PHP
Group. PHP
originally stood for Personal Home Page, but it now stands for the recursive initialism PHP
: Hypertext Preprocessor.
PHP
code may be executed with a command line interface (CLI
), embedded into HTML
code, or used in combination with various web template systems, web content management systems, and web frameworks. PHP
code is usually processed by a PHP
interpreter implemented as a module in a web server or as a Common Gateway Interface (CGI
) executable. The web server outputs the results of the interpreted and executed PHP
code, which may be any type of data, such as generated HTML
code or binary image data. PHP
can be used for many programming tasks outside of the web context, such as standalone graphical applications and robotic drone control.
The standard PHP
interpreter, powered by the Zend Engine
, is free software released under the PHP
License. PHP
has been widely ported and can be deployed on most web servers on almost every operating system and platform, free of charge.
The PHP
language evolved without a written formal specification or standard until 2014
, with the original implementation acting as the de facto
standard which other implementations aimed to follow. Since 2014
, work has gone on to create a formal PHP
specification.
As of September 2019
, over 60%
of sites on the web using PHP
are still on discontinued/"EOLed" version 5.6
or older; versions prior to 7.1
are no longer officially supported by The PHP
Development Team, but security support is provided by third parties, such as Debian.
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