fopen will not listen

[lentin64]

When I try this:

$fd=fopen("info/someone.html","a+");
fwrite($fd,"Success");
fclose($fd);

I get the error:

Warning: fopen("http://www.stevenchalker.net/info/someone.html", "a+") - Success in /home3/stevenc/public_html/register.php on line 5

Warning: fwrite(): supplied argument is not a valid File-Handle resource in /home3/stevenc/public_html/register.php on line 6

Warning: fclose(): supplied argument is not a valid File-Handle resource in /home3/stevenc/public_html/register.php on line 7

[turrets]

http://'s can only be opened with 'r' attribute
refer to http://www.php.net/manual/en/function.fopen.php

[lentin64]

well sames goes with 'info/$user.info'