This line (at least) is being output before the cookie can be set:
echo '<h2>'.$hash.'</h2>';
Sending output to the screen (even empty lines) will prevent cookies being set.
From the PHP docs:
Like other headers, cookies must be sent before any output from your
script (this is a protocol restriction). This requires that you place
calls to this function prior to any output, including<html>and
<head>tags as well as any whitespace.
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