File_get_contents of an iFrame?

Basically I have an iframe of an external site, which has html that is auto-generated.

What I want to do is to use file_get_contents to get the html within that iFrame, which is hosted on my domain.

So something like this:

[CODE]
<iframe src=”othersite.com”></iframe>
<?php
$contents = file_get_contents(//iFrame Content);
?>
[/CODE]

I would love someone to point me into the right direction. ?

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