If al you want to do is have the page read and printed to the screen, use
readfile("path/to/mypage.htm");
That will read it and print it to the screen all in one shot.
If you actually need to read it into a variable, you have a few options.
$MyArray = file("path/to/mypage.htm");
$MyArray each element in the array will conatain 1 line of the document you have read into it. This would be my prefferred method.
If you want it all in a single string variable,
$file_name = "path/to/mypage.htm";
$fd = fopen ($file_name, "r");
$my_File = fread ($fd, filesize ($file_name));
fclose ($fd);
$my_File will then hold the entire file. Since this reads to the end of the file, becareful that you know how big the file is. You wouldn't want to read a file several megs in size without knowing it. 🙂