fopen将变量传递给远程服务器

I'm using fopen to allow webmasters to access data directly from my web servers soon. The problem is my server doesn't see a few things it normally see's when its loading through JavaScript.

So I want to pass a few variables using fopen or file_get_contents depending which is quicker performance once I do so benchmarks.

I'm using the example code below

$file = 'http://example.com/get.php?var1=foo&var2=foo';
$fp = fopen($file, 'rb');
fpassthru($fp);

but it doesn't pass the get variables through. I don't want to use cURL just encase they don't have it installed and it seems to be slow also. I'm trying to make it very simple for the webmasters. How would I go about passing the variables through?

Update

I found if you have a space in the variable it stops sending the rest of the variable string. How do I allow spaces without it interrupting the rest of the variables? It also real buggy using multiple variables as it doesn't send them all for me.

On updated question - perhaps URL encoding the spaces in the variables - replace space with %20 may help.

In the past, I have used file_get_contents with URLs. Please check your PHP.ini to make sure that allow_url_fopen=On and also urlencode your variable, as mentioned in another question.

(don't just replace the ' ' to %20)