Tom Morris

// tom morris - tommorris.org
// invoke with ob_start("callback"); ... ob_end_flush();
function callback($buffer) {
        $buffer = str_replace("<b>", "<strong>", $buffer);
        $buffer = str_replace("</b>", "</strong>", $buffer);
        $buffer = str_replace("<B>", "<strong>", $buffer);
        $buffer = str_replace("</B>", "</strong>", $buffer);
        $buffer = str_replace("<i>", "<em>", $buffer);
        $buffer = str_replace("</i>", "</em>", $buffer);
        $buffer = str_replace("<I>", "<em>", $buffer);
        $buffer = str_replace("</I>", "</em>", $buffer);
        $output = SmartyPants($buffer);
        // get the default mime type accepted by browser
        $defaultmime = mimeTypeChecker($_SERVER);
        // load into DOM and test
        $domtest = new DOMDocument('1.0');
        if (@$domtest->loadXML($smartypants) == TRUE) {
          $mime = $defaultmime;
        } else {
          $mime = "text/html";
        }
        // return headers
        header('Content-Type: ' . $mime . ';charset=utf-8');
        header('Vary: Accept');
        return $output;
}