SimpleXML Parsing Question [duplicate]

Question

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Trying to parse this SOAP response but xpath() is returning

Debug Warning: SimpleXMLElement::xpath() Undefined namespace prefix Debug Warning: SimpleXMLElement::xpath() evaluation failed

 $result = '<?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"> <env:Header xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/> <env:Body xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <v4:TrackReply xmlns:v4="http://fedex.com/ws/track/v4"> ... </v4:TrackReply> </env:Body> </soapenv:Envelope>'; $xml = simplexml_load_string($result,NULL,NULL,'http://schemas.xmlsoap.org/soap/envelope/'); foreach($xml->xpath('env:Body') as $body){ //drill down here... }

brian_d · Accepted Answer · 2011-06-23 16:15:57Z

Try registering the namespace to 'env'

$xml->registerXPathNamespace('env', 'http://schemas.xmlsoap.org/soap/envelope/');

Edit This code sets the namespace of child elements within body

$bodies = $xml->xpath('env:Body'); foreach($bodies as $body){ $reply = $body->children('v4', TRUE)->TrackReply; var_dump($reply); }

Alternatively, you can get an element like TrackReply directly with:

$xml->registerXPathNamespace('env', 'http://schemas.xmlsoap.org/soap/envelope/'); $xml->registerXPathNamespace('v4', 'http://fedex.com/ws/track/v4'); var_dump($xml->xpath('env:Body/v4:TrackReply'));

by calling registerXPathNamespace() I am able to enter my foreach loop because $xml->xpath('env:Body') now creates an empty SimpleXMLElement object
@Slinky see updated answer - the SimpleXMLElement objects do look empty, but actually contain information

mensch · Accepted Answer · 2011-06-23 16:30:52Z

SimpleXML ignores the env: part of the XML structure and instead returns an object constructed like this:

SimpleXMLElement Object ( [Header] => SimpleXMLElement Object ( ) [Body] => SimpleXMLElement Object ( ) )

You can access the body with the following XPath query: $xml->xpath('Body') or just access the child by using the following syntax: $xml->Body.

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