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bar.php
==========
        $foo="FOOBAR";
        echo "outside: $foo\n";
        function foo() {
            global $foo;
            echo "inside: $foo\n";
        }
        foo();


foo.php
=====
function cached_foo() {
    ob_start();
    include('bar.php');
    $data = ob_get_clean();
    return $data;
}

echo  cached_foo();


output
====
outside: FOOBAR
inside:


WTF PHP?!?!