/*==============================================================================
  Title: phiXmlHeader
  Category: Plugin
  Author: Phize
  Author URI: http://phize.net
  License: GNU General Public License(http://www.gnu.org/licenses/gpl.html)
  Version: 1.2.0
  Last Update: 2007-07-30T21:16:01+09:00
==============================================================================*/



$event = &$modx->Event;

if ($event->name == 'OnWebPagePrerender') {
    $contentType = $modx->documentObject['contentType'];
    $charset = $modx->config['modx_charset'];

    $accept = $_SERVER['HTTP_ACCEPT'];
    $ua = $_SERVER['HTTP_USER_AGENT'];

    $isXml = preg_match('/application\/(.+?)\+xml/i', $contentType);
    $supportsXml = (stristr($accept, $contentType) || stristr($ua, 'Opera'));
    $isValidator = stristr($ua, 'W3C_Validator');
    $isLint = stristr($ua, 'Another_HTML-lint');

    if ($isXml && $contentType == 'application/xhtml+xml') {
        if (!$supportsXml && !$isValidator && !$isLint) {
            header('Content-Type: text/html; charset=' . $charset);
        }
    } else if ($isXml && !$supportsXml) {
        header('Content-Type: text/xml; charset=' . $charset);
    }
}