What is php file?

PHP file can contain text, HTML tags and scripts then returned to the browser as plain HTML .
Example: php like this extension of ".php", ".php3", or ".phtml"

What is php?

PHP stands for PHP Hypertext preprocessor. PHP is a powerful tool for making dynamic and interactive Web pages. PHP is the widely-used, free, and efficient. PHP is a server-side scripting language like ASP.PHP scripts are executed on the server side .PHP supports many type of Datebases that MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC and so on. PHP is an Open source software. PHP is Free to download and we can use