There are a few ways you could do it and mostly it will depend on the set up of the server you are running on.
file_get_contents() - Your hosting provider may not allow you to pull data from other servers in this way. Give it a try though (also look into other related file functions)
curl - Your hosting provider may not allow the use of curl or it may not be included with your php setup. Also, give it a go...its worth knowing Everything you need to know is here : http://php.net/manual/en/book.curl.php