PHP/MySQL: Should I close the database connection before or after redirecting the browser?

Is there a difference?  Is one of theses preferable?  If I close the database connection before redirecting the header, I am worried that the process could seem slower.  On the other hand, if redirect the browser before closing the database connection , I am worried that the database connection might not actually get closed!

<php
  mysql_close($crm_db);
  header('Location: ' . (!empty($_SERVER['HTTPS']) ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . rtrim(dirname($_SERVER['PHP_SELF']), '/\\') .'/', true, 302);
  exit;
?>

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<?php
 header('Location: ' . (!empty($_SERVER['HTTPS']) ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] .  rtrim(dirname($_SERVER['PHP_SELF']), '/\\') .'/', true, 302);
 mysql_close($crm_db);
 exit;
?>

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