If you need php, you could use this. I use this method to get various information for my Server:
http://pastebin.com/uxBMMFaS
replace YOURGROUPNAME with the customurl you gave your steamgroup.
It is requiered that your host has it enabled that file_get_contents can access other websites. If not, it will not work, regradless which method you will choose.
Also, if you do not post your code, we cannot help you.
Side Note: You should stick to xml as much as possible, I just use the above method because informations I need are not available in xml or with the api.