Using PHP program ($$$)

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PHP is a programming language that will create 'extra content' for your web html file before the server sends it back to the browser.

When a user selects a page in his browser that points to a php page on the web server a sequence of things happen.

1. The request for the page is sent to the web server with a filename ending in .php

2. The web server software (apache in many cases) sees the .php on the file extension and will start tell the php engine installed as part of the web server to process the page.

3. The php engine will open the php file and look for any <? ?> enclosed code blocks. It will run the code that is between the <? ?> code blocks and any output will be inserted into the existing HTML inplace of the code block area.

4. Once all the code blocks have been executed, the final HTML will be passed to the web server.

5. The web server will in turn send it over the internet to the original browser, who will display it as a new page.

Question?
What file extension does a php file have normally?