How does the php file display xml-style files?

The PHP file displays xml-style files. how can this problem be solved first? it is not an external link.
Where to use the api, there is an example, http://tuan.cctcct.com/interface/xml/team_list.asp
How does asp display xml? How can php achieve this?
This file contains a lot of list, take one of them for example: http://tuan.cctcct.com/interface/xml/team_detail.asp? Team _id = 1562
You can directly generate the file with the id. you do not need to generate an xml file for each file, which is much easier.
Thank you.

Reply to discussion (solution)

Header ('content-Type: text/XML'); header ('charset = utf-8 ');

Then echo the xml file.

Header ('content-Type: text/XML'); header ('charset = utf-8 ');

Then echo the xml file.

Thank you. thank you.