Pohoda Parse XML

example.php

<?php

$content = '<?xml version="1.0" encoding="Windows-1250"?>
           <dat:dataPack id="Za001" ico="12345678" application="StwTest" version="2.0" note="export"  
           xmlns:dat="http://www.stormware.cz/schema/version_2/data.xsd"  
           xmlns:stk="http://www.stormware.cz/schema/version_2/stock.xsd"
           xmlns:ftr="http://www.stormware.cz/schema/version_2/filter.xsd"
           xmlns:lStk="http://www.stormware.cz/schema/version_2/list_stock.xsd"  
           xmlns:typ="http://www.stormware.cz/schema/version_2/type.xsd">
             <dat:dataPackItem id="a55" version="2.0">
               <lStk:listStockRequest version="2.0" stockVersion="2.0">
                 <lStk:requestStock>
                   <ftr:filter>
                     <ftr:code>Z220</ftr:code>
                   </ftr:filter>
                 </lStk:requestStock>
               </lStk:listStockRequest>
             </dat:dataPackItem>
           </dat:dataPack>';

$xml = new SimpleXMLElement($content);
$ns = $xml->getDocNamespaces();

var_dump($xml->children($ns['dat'])->dataPackItem->children($ns['lStk'])->listStockRequest->requestStock->children($ns['ftr'])->filter->code);

Thanks. I published my version at https://gist.github.com/mikaelz/288d1611eec0f80c1293

Quick & dirty one ?

$code = $xml->xpath('//ftr:code');
echo $code[0];