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Paradigm imperative, object-oriented, Procedural, reflective
Designed by Rasmus Lerdorf
Developer The PHP Group
First appeared 1995; 22 years ago (1995)[1]
Stable release 7.1.5 / May 11, 2017; 2 months ago (2017-05-11)[2]
Typing discipline Dynamic, weak
Implementation language C
OS Cross-platform
License PHP License[3]
Filename extensions .php, .phtml .php4 .php3 .php5 .phps
Major implementations
Zend Engine, Phalanger, Quercus, Project Zero, HHVM
Influenced by
C, C++, Java, Perl, Tcl[1]

PHP (PHP: Hypertext Preprocessor) is a scripting language that helps people make web pages more interactive by allowing them to do more things.

A website programmed with PHP can have pages that are password protected. A website with no programming cannot do this without other complex things. Standard PHP file extensions are: .php .php3 or .phtml, but a web server can be set up to use any extension.[4][5]

Its structure was influenced by many languages like C, Perl, Java, C++, and even Python. It is considered to be free software by the Free Software Foundation.[6]

Wikipedia, which runs on MediaWiki, uses the PHP scripting language.

History[change | change source]

PHP was first created by a man called Rasmus Lerdorf in 1995.[7] It is now developed and improved by a large team of people.

Example[change | change source]

An example Hello World program:

echo "Hello, World!";

It is common to put PHP code inside a HTML document, for example:

<!DOCTYPE html>
		<title>Hello World</title>
		<?= '<p>Hello World</p>'; ?>

Related pages[change | change source]

References[change | change source]

  1. 1.0 1.1 Rasmus Lerdorf began assembling C code originally written for CGI scripts into a library and accessing the library's functions, including SQL queries, through HTML-embedded commands in 1994; Lerdorf, Rasmus (2007-04-26). "PHP on Hormones - history of PHP presentation by Rasmus Lerdorf given at the MySQL Conference in Santa Clara, California" (mp3). The Conversations Network. Retrieved 2009-12-11. "Every day I would change the language drastically, and it didn't take very long, so by 1995, mid-1995 or so, PHP looked like this. This isn't that far from what PHP looks like today, actually."
  2. "PHP 7.1.5 Released". The PHP Group. Retrieved 2 June 2017.
  3. "Official PHP License Information". The PHP Group. Retrieved 21 April 2011.
  4. Retrieved on 30 October, 2007
  5. "Apache Module mod_mime AddHandler Directive". Retrieved 30 September 2015.
  6. "GPL-Incompatible, Free Software Licenses". Various licenses and comments about them. Free Software Foundation.
  7. "History of PHP". The PHP Group. Retrieved 18 July 2011.

Other websites[change | change source]