php怎么将work转为pdf

class PDFConverter
{    private $com;    /**
     * need to install openoffice and run in the background
     * soffice -headless-accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard     */
    public function __construct()
    {        try {            $this->com = new COM('com.sun.star.ServiceManager');
        } catch (Exception $e) {            die('Please be sure that OpenOffice.org is installed.');
        }
    }    /**
     * Execute PDF file(absolute path) conversion
     * @param $source [source file]
     * @param $export [export file]     */
    public function execute($source, $export)
    {        $source = 'file:///' . str_replace('\', '/', $source);        $export = 'file:///' . str_replace('\', '/', $export);        $this->convertProcess($source, $export);
    }    /**
     * Get the PDF pages
     * @param $pdf_path [absolute path]
     * @return int     */
    public function getPages($pdf_path)
    {        if (!file_exists($pdf_path)) return 0;        if (!is_readable($pdf_path)) return 0;        if ($fp = fopen($pdf_path, 'r')) {            $page = 0;            while (!feof($fp)) {                $line = fgets($fp, 255);                if (preg_match('//Count [0-9]+/', $line, $matches)) {                    preg_match('/[0-9]+/', $matches[0], $matches2);                    $page = ($page < $matches2[0]) ? $matches2[0] : $page;
                }
            }            fclose($fp);            return $page;
        }        return 0;
    }    private function setProperty($name, $value)
    {        $struct = $this->com->Bridge_GetStruct('com.sun.star.beans.PropertyValue');        $struct->Name = $name;        $struct->Value = $value;        return $struct;
    }    private function convertProcess($source, $export)
    {        $desktop_args = array($this->setProperty('Hidden', true));        $desktop = $this->com->createInstance('com.sun.star.frame.Desktop');        $export_args = array($this->setProperty('FilterName', 'writer_pdf_Export'));        $program = $desktop->loadComponentFromURL($source, '_blank', 0, $desktop_args);        $program->storeToURL($export, $export_args);        $program->close(true);
    }
}

$arr = array('doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx');

$converter = new PDFConverter();

foreach ($arr as $ext) {
    $source = __DIR__ . '/office/test.' . $ext;
    $export = __DIR__ . '/pdf/test.' . $ext . '.pdf';
    $converter->execute($source, $export);
    echo '<p>' . $ext . ' Done</p>';
}