php fopen: failed to open stream: HTTP request failed! HTTP/1.0 403

I am receiving an error message in PHP 5 when I try to open a file of a different website. So the line

fopen("http://www.domain.com/some开发者_C百科f­ile.php", r)

returns an error

Warning: fopen(www.domain.com/somefile.php) [function.fopen]: failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in D:\xampp\htdocs\destroyfiles\index.php on line 2

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Your PHP app failed to authenticate. The request URI should be:

http://user:password@www.domain.com/somefile.php

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It looks like your PHP client (i.e. the server on which your PHP script is running) isn't allowed to get http://www.domain.com/somef­ile.php, by the server on www.domain.com.