PHP server-side web browser is a simple set of scripts with anonymizing support to do folowing:
- Take a URL from user input
- Connects to the server according to the URI, passing through redirects (Location header) and gets the reply headers of the final URL.
- If the content type of the URL is text/html, it parses the content and changes the values of some attributes of some tags (a, img, form) to point them to the script itself with original URL as a parameter.
- Other content types are not changed.
- The content of the URL is sent to the user agent.

So one can browse Internet and the Web servers will see that the client is a hosting server.

Functions of PHP server-side web browser:
- You want to browse some URL and want that it sees your hosting IP instead of your browser machine address.
- Your traffic to Internet is charged and to your hosting is not.
- You want to check the connection between your hosting server and another other server.