$wxr = file_get_contents(__DIR__ . '/test.wxr');
$tokens = stream_next_xml_token(chunk_text($wxr));
foreach($tokens as $processor) {
    if ($processor->get_token_type() === '#cdata-section' && $processor->matches_breadcrumbs(array('content:encoded'))) {
        echo "\n " . dump_token($processor);
    }
}