PHP (which stands for PHP: Hypertext Preprocessor) is a server-side scripting language. When a browser requests a PHP page from a PHP-enabled server, the server interprets the PHP code and sends the resulting HTML to the requesting browser. For more information on PHP, see the PHP pages, as described in HTML and Web technologies resources.
A block of PHP code begins with <? and ends with ?>. If View > Invisible Elements is selected, Dreamweaver displays a PHP icon in the Document window to mark the location of PHP code.