root/zip/examples/odt.php

<?php
/* $Id$ */
$reader = new XMLReader();

$reader->open('zip://' . dirname(__FILE__) . '/test.odt#meta.xml');
$odt_meta = array();
while ($reader->read()) {
        if ($reader->nodeType == XMLREADER::ELEMENT) {
                $elm = $reader->name;
        } else {
                if ($reader->nodeType == XMLREADER::END_ELEMENT && $reader->name == 'office:meta') {
                        break;
                }
                if (!trim($reader->value)) {
                        continue;
                }
                $odt_meta[$elm] = $reader->value;
        }
}
print_r($odt_meta);