Question about part 2

Hello,

I was wondering when extracting my code for the cascading style sheet, why does it cut off my last 6 characters?

My code is:
function cascade($myString) {
$start = strpos($myString, "<style");
$finish = strpos($myString, "style>");
$length = $finish - $start;
$final = htmlspecialchars(substr($myString, $start, $length));
echo $final;
}

and when it is called, it displays:
<style...code code code code.... </

It won't display the last 6 characters and I was wondering if anyone could explain why it does that? And is there a way to fix it?

Thanks!