$word = new COM("Word.Application") or die ("Could not initialise Object.");
// set it to 1 to see the MS Word window (the actual opening of the document)
$word->Visible = 0;
// recommend to set to 0, disables alerts like "Do you want MS Word to be the default .. etc"
$word->DisplayAlerts = 0;
// open the word 2007-2013 document 
$word->Documents->Open('yourdocument.docx');//这个是绝对文件地址，如c:\www\1.txt这样的地址才通过
// save it as word 2003
$word->ActiveDocument->SaveAs('newdocument.doc');//转换成doc格式
// convert word 2007-2013 to PDF
$word->ActiveDocument->ExportAsFixedFormat('yourdocument.pdf', 17, false, 0, 0, 0, 0, 7, true, true, 2, true, true, false);//转换为pdf模式
// quit the Word process
$word->Quit(false);
// clean up
unset($word);

function word2pdf($lastfnamedoc,$lastfnamepdf)
{
  $word = new COM("Word.Application") or die ("Could not initialise Object.");
 // set it to 1 to see the MS Word window (the actual opening of the document)
 $word->Visible = 0;
 // recommend to set to 0, disables alerts like "Do you want MS Word to be the default .. etc"
 $word->DisplayAlerts = 0;
 // open the word 2007-2013 document 
 // $word->Documents->Open('3.docx');
// $wordname='D:/www/fa/3.doc';
  $word->Documents->Open($lastfnamedoc);
 // save it as word 2003
// $word->ActiveDocument->SaveAs('4.doc');
 // convert word 2007-2013 to PDF
 // $pdfname='D:/www/fa/3.pdf';
 $word->ActiveDocument->ExportAsFixedFormat($lastfnamepdf, 17, false, 0, 0, 0, 0, 7, true, true, 2, true, true, false);
 // quit the Word process
 $word->Quit(false);
 // clean up
 unset($word);
}