PHP is a scripting language originally designed for the dynamic page. Has grown to include the ability to command-line interface can be used in graphics applications independent.
Although the initial establishment of PHP Rasmus Lerdorf in 1995, especially the implementation of PHP is now generated by the PHP Group, and as a de facto standard for PHP, as there is no formal specification. PHP is a free software license with PHP, but it does not comply with the GNU General Public License (GPL), as a result of restrictions on the use of PHP.
PHP is a widely used general-purpose scripting language that is suitable for Web development and can be inserted in the HTML. Usually run in the web server, taking PHP code as input and output to create a web page. Can be used on the network server and the most in almost all operating systems and platforms, for free. PHP is installed in more than 20 million Web sites and 100 million web servers.