PHP is a general-purpose scripting language geared toward web development.[8] It was originally created by Danish-Canadian programmer Rasmus Lerdorf in 1993 and released in 1995.[9][10] The PHP reference implementation is now produced by The PHP Group.[11] PHP was originally an abbreviation of Personal Home Page,[12][13] but it now stands for the recursive initialism PHP: Hypertext Preprocessor.[14]
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 a variety of operating systems and platforms.[17]
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.[18]
W3Techs reports that as of January 2023, "PHP is used by 77.8% of all the websites whose server-side programming language we know."[19] It also reports that only 8% of PHP users use the currently supported 8.x versions. Most use unsupported PHP 7, more specifically 7.4, and even PHP 5 has 23% of the use, also not supported with security updates, and known to have serious security vulnerabilities.
