Create a highly precise detecting script of rss version using PHP

Create a highly precise detection script of rss version using PHP. This software is for detecting RSS version from webpage. For example, this url ("[login to view URL]") have 3 types of rss. This url is written the version of rss, but it's not necessarily that the rss versions are certainty written in these tags. So, Once you get these rss tags, then fetch again the rss url that you got from webpage, and check the rss version precisely. So this script requires a parameter below. --> web page url And the return value is two-dimensional array of rss url and version. Please make it simple and light software. Don't encrypt or obfuscate the source code. Don't forget comments. You can use, GPL,LGPL,BSD,MIT License outer library. But don't use the else. I prefer the latter of these.