Get value from xml using the attribute with xpath in php

Question

I want to get the value '23452345235' of the parameter with name="userID" from this xml:

<?xml version="1.0" encoding="UTF-8"?>
    <callout>
        <parameter name="UserID">
            23452345235
        </parameter>

        <parameter name="AccountID">
            57674567567
        </parameter>

        <parameter name="NewUserID">
            54745674566
        </parameter>

     </callout>

I'm using this code:

$xml = simplexml_load_string($data);
$myDataObject = $xml->xpath('//parameter[@name="UserID"]');
var_dump($myDataObject);

And I'm getting this:

array(1) {
[0] =>
    class SimpleXMLElement#174 (1) {
        public $@attributes =>
        array(1) {
          'name' =>
          string(6) "UserID"
        }
    }
}

I actually want to get the value of '23452345235' or receive the parameter in order to get this value.

What I'm doing wrong?

You're overlooking that you have it already, it's the first (and only) value in the array: var_dump(trim($myDataObject[0])); - outputs: string(11) "23452345235". — hakre
– hakre, Commented Oct 12, 2014 at 21:16

Kevin · Accepted Answer · 2014-09-15 08:55:58Z

3

Well you can (optionally) put it under a loop. Like this:

$myDataObject = $xml->xpath('//parameter[@name="UserID"]');
foreach($myDataObject as $element) {
    echo $element;
}

Or directly:

echo $myDataObject[0];

Actually is quite straightforward, as seen on your var_dump(), its an array, so access it as such.

edited Sep 15, 2014 at 8:55

answered Sep 15, 2014 at 8:11

Kevin

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Comments

ThW · Accepted Answer · 2014-09-15 08:53:46Z

1

SimpleXMLElement::xpath() can only return an array of SimpleXMLElement objects, so it generates an element and attaches the fetched attribute to it.

DOMXpath::evaluate() can return scalar values from Xpath expressions:

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);

var_dump($xpath->evaluate('normalize-space(//parameter[@name="UserID"])'));

Output:

string(11) "23452345235"

answered Sep 15, 2014 at 8:53

ThW

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