Including file Inside class

I'm trying to setup a class that will allow a file to be included on
the page. It goes something like:

<?php
class myClass {
... ... ...
function includeFile(){
if(file_exists($this->include_file)){
include($this->include_file);
} else {
$this->error("file missing");
}
}
... ... ...
}

$foo = "bar";

$page = new myClass();
$page->include_file = "the_file.php";
$page->includeFile();
?>

// the_file.php
<?php echo $foo; ?>



It has something to do with variable scope and accessing globals or
something, I'm not sure. My question is how should I setup my class so
that I do not have to use "return" at the bottom of any files I want
to include with my class? I want the includes to function just like
normal includes.

I tried

<?php
class myClass {
... ... ...
function includeFile(){
global $GLOBALS;
global $HTTP_SERVER_VARS;
if(file_exists($this->include_file)){
include($this->include_file);
} else {
$this->error("file missing");
}
}
... ... ...
}


but that still doesn't make $foo print "bar".

Thanks for any help on how to accomplish this.
.

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