PHP is a programming language.

The PHP means Hypertext Preprocessor (PHP) is a scripting language,  where we develop  dynamic website  interacts with databases.PHP is free and it Download from www.php.net
PHP is a server side programming  language. Therefore, you need a server to run PHP.

1. LAMP :-(Linux Apache MySQL PHP);
2. WAMP :-(Windows Apache MySQL PHP);
3. MAMP :-(MAC Apache MySQL PHP);
4. XAMPP:-(x-os Apache MySQL PHP Perl); 

For develop and run PHP need  three components to be installed in your computer.

1. Linux or windows server (Ex:-WAMP)
2. Code editor  (Ex:-notepad++)
3. web browser (Ex:- mozilla firefox)