PHP
PHP
PHP (a recursive acronym for "PHP: Hypertext Preprocessor") is a general-purpose scripting language originally designed for web development to produce dynamic web pages. It is one of the most widely used server-side scripting languages, powering a large percentage of websites, including major platforms like WordPress and Facebook (in its early versions). PHP code is typically embedded into HTML and executed on a web server, generating dynamic content before the page is sent to the client.
History
PHP was created by Rasmus Lerdorf in 1994 as a set of Common Gateway Interface (CGI) scripts he called "Personal Home Page Tools." It was later rewritten and extended by Andi Gutmans and Zeev Suraski, who released PHP 3 in 1998, which introduced the new name PHP: Hypertext Preprocessor. The Zend Engine was developed for PHP 4, significantly improving performance and modularity. PHP 5, released in 2004, added object-oriented programming features and PDO for database access. A major rewrite, PHP 7, was released in 2015 and brought substantial speed improvements and reduced memory usage. PHP 8, released in 2020, introduced JIT compilation and named arguments.
Features
- Cross-platform: Runs on Unix, Linux, Windows, and macOS.
- Embedded scripting: PHP code can be mixed with HTML and other template languages.
- Database support: Built-in support for many databases, including MySQL, PostgreSQL, SQLite, and MariaDB.
- Object-oriented: Full support for classes, interfaces, traits, and namespaces.
- Extensive library – A large set of built-in functions for strings, arrays, file handling, and more.
- Security features: Functions for session management, input filtering, and encryption.
- Community and ecosystem: A vast collection of frameworks (Laravel, Symfony, CodeIgniter) and package management (Composer).
Usage
PHP is most commonly used for server-side web development, often in combination with a database and a web server like Apache HTTP Server or Nginx. It also supports command-line scripting and can be used for desktop applications via extensions like PHP-GTK. Major content management systems built with PHP include WordPress, Drupal, and Joomla!.