php用openoffice转换csv为pdf乱码,请教如何解决

<?php  set_time_limit(0);function MakePropertyValue($name,$value,$osm){    $oStruct = $osm->Bridge_GetStruct("com.sun.star.beans.PropertyValue");    $oStruct->Name = $name;    $oStruct->Value = $value;    return $oStruct;}function word2pdf($doc_url, $output_url){    $fdoc_url = "file:///" . $doc_url;    $foutput_url = "file:///" . $output_url;    $osm = new COM("com.sun.star.ServiceManager") or die ("Please be sure that OpenOffice.org is installed.n");      $args = array(MakePropertyValue("Hidden",true,$osm));    $oDesktop = $osm->createInstance("com.sun.star.frame.Desktop");    $oWriterDoc = $oDesktop->loadComponentFromURL($fdoc_url,"_blank", 0, $args);    $export_args = array(MakePropertyValue("FilterName","writer_pdf_Export",$osm));    $oWriterDoc->storeToURL($foutput_url,$export_args);    $oWriterDoc->close(true);}$output_dir = "F:/ComsenzEXP/wwwroot/";$doc_file = "F:/ComsenzEXP/wwwroot/11.csv";$pdf_file = "513.pdf";$output_file = $output_dir . $pdf_file;if(!file_exists($output_file)){word2pdf($doc_file,$output_file);}?>