php 实现html转为rtf格式

<?php
$html2RTFCom = new COM("HTML2RTF.Converter"); 
$html2RTFCom->PreserveImages = true; 
$html2RTFCom->PageNumbers = 1;
$html2RTFCom->PageNumbersAlignH = 1;
$html2RTFCom->PageNumbersAlignV = 5;
$htmlFile = "a.html";
$rtfFile = "a.rtf";
$result =$html2RTFCom->ConvertFile($htmlFile,$rtfFile, "head", "foot");
print($result);
unset($html2RTFCom);
echo "done";    
?>