Google Sitemap Generator

Google Sitemap Generator written in php. Should crawl a website, and extract all files/pages on a website, from the input given by the visior. The program should be freely availible to the visitor, and require no login/registration. The sitemap should request all appropreiate details for google, such as priority, etc. The generator should also generate a [login to view URL] file, containing only all of the urls gathered from the crawl. Must be written in php.