simplexml - Reading Xml Nodes with PHP -

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i have problem php. cannot read xml php, , simplexml. how can do.

my xml files below. want companylist.

<?xml version="1.0" encoding="utf-8"?> <soap:envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">   <soap:header>     <wsa:action>http://www.temp/response</wsa:action>     <wsa:messageid>urn:uuid:eac190a5-c833-4dee-b4ef-fa81b0bad5c1</wsa:messageid>     <wsa:relatesto>urn:uuid:834ace07-1e96-49d9-b958-3b2b87169917</wsa:relatesto>     <wsa:to>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:to>     <wsse:security>       <wsu:timestamp wsu:id="timestamp-55f3bafa-087a-4971-975d-a314957b4282">         <wsu:created>2016-11-17t15:12:46z</wsu:created>         <wsu:expires>2016-11-17t15:17:46z</wsu:expires>       </wsu:timestamp>     </wsse:security>   </soap:header>   <soap:body>     <listresponse xmlns="http://fatura.edoksis.net">       <companyresult>         <success>1</sonuc>         <companylist>           <company>             <identifier>8380436088</identifier>             <registertime>2016-10-21t00:00:00z</registertime>           </company>           <company>             <identifier>8380436088</identifier>             <registertime>2016-10-21t00:00:00z</registertime>           </company>         </companylist>       </companyresult>     </companyresult>   </soap:body> </soap:envelope> 

$dom = new domdocument; $dom->loadxml($response); $books = $dom->getelementsbytagname('identifier'); foreach ($books $book) {     echo $book->nodevalue ."</br>"; }