Xpath parser class for PHP

I need a parser class for PHP. I want to call the functions with a couple of paramaters and I want the output to be structured with Xpath (part of XML). In parameter: 1) Starturl 2) Xpath expr (default:None) - An expression can look like this //head/meta 3) Force encoding/charset (Default: Use the charset from Starturl meta) 4) Accept gzip-encoded response (Default: Yes) - The class need to handle these encoded reponds 5) User-Agent - Be able to change the user agent The output should be structured in Xpath nodes (See attached image)