Word:

function write_word() {
	$word = new COM("word.application");
	$word->Visible = 0;
	$word->Documents->Add();
	$word->Selection->PageSetup->LeftMargin = '2"';
	$word->Selection->PageSetup->RightMargin = '2"';

	//Setup the font
	$word->Selection->Font->Name = 'Verdana';
	$word->Selection->Font->Size = 8;

	//Write some text
	$word->Selection->TypeText("This is a test document");
        //Insert an image
        $word->Selection->InlineShapes->addPicture("C:\\temp\\test.png");

	//Save the document as DOC file
	$word->Documents[1]->SaveAs("c:\\docs\\test1.doc");

	//quit and release COM resources
	$word->quit();
	$word->Release();
	$word = null;
}

Excel:

function write_excel() {
	$excel = new COM("excel.application");
	$excel->Visible = 0;

	//Create a new workbook
	$wkb = $excel->Workbooks->Add();
	$sheet = $wkb->Worksheets(1);

	//This code adds the text 'myvalue' on row 2, column 4
	$sheet->activate;
	$cell = $sheet->Cells(2, 4);
	$cell->Activate;
	$cell->value = 'myvalue';

	$wkb->SaveAs("C:\docs\test.xls");

	//close and free resources
	$wkb>Close(false);
	$excel->Workbooks->Close();
	$excel->Quit();
}

PowerPoint:

function write_ppt() {

	$powerpnt = new COM("powerpoint.application");

	//Creating a new presentation
	$pres = $powerpnt->Presentations->Add();

	//Adds the first slide. "12" means blank slide
	$pres->Slides->Add(1, 12);

	//Adds another slide. "10" means a slide with a clipart and text
	$pres->Slides->Add(2, 10);

	//Adds a textbox
	$pres->Slides[1]->Shapes->AddTextbox(1, 20, 50, 300, 40);

	//Save the document as PPT file
	$powerpnt->Presentations[1]->SaveAs("C:\Docs\test1.ppt");

	//free resources and quit powerpoint
	$powerpnt->quit();
}