<?php

if(!file_exists('word'))
{
    mkdir('word');
}

$dom = new DOMDocument();

$XMLDocument = $dom->createElement('w:document');
$XMLDocument->setAttribute('xmlns:w', 'http://schemas.openxmlformats.org/wordprocessingml/2006/main');
$dom->appendChild($XMLDocument);

$XMLBody = $dom->createElement('w:body');
$XMLDocument->appendChild($XMLBody);

$XMLParagraph = $dom->createElement('w:p');
$XMLBody->appendChild($XMLParagraph);

$XMLRun = $dom->createElement('w:r');
$XMLParagraph->appendChild($XMLRun);

$XMLText = $dom->createElement('w:t', "Hello world!");
$XMLRun->appendChild($XMLText);

$dom->save('word/document.xml');

?>