phpQuery::newDocumentFileXML PHP Method

    public static function newDocumentFileXML($file, $charset = null)
    {
        $contentType = $charset ? ";charset={$charset}" : '';
        return self::newDocumentFile($file, "text/xml{$contentType}");
    }

 public function loadWP()
 {
     if (file_exists($this->wpPath)) {
         phpQuery::newDocumentFileXML($this->wpPath);
         $itemArr = pq("channel item");
         phpQuery::each($itemArr, "WordPress::parseWpItem");
     } else {
         $this->_error = "wordpress.xml文件不存在";
     }
 }