fopen() || Execute read file as php page; not plain text

Any ideas here? was able to use an absolute reference on my local machine to execute read file contents; e.g. fopen('http://www.mysite.com/index.php', 'a'), but on the host webserver no such luck. Administrator said I can only use relative paths. Problem is, when I use a relative path, I just get plain text; i.e. the read file doesn't get executed as php. eval()'s not an option either, as the read file(s) has apostrophes, quotes top-to-bottom. Basically, I just need the file-to-be-read to have the queries within it run as if it were run in the web browser. All clues appreciated as I'm at my wits end here -- can't find didly on this subject on the net..... --Noah --