Select xml element using attribute value

Question

<?xml version='1.0'?> 
<error>
<error_detail code="0">Successfully</error_detail>
<error_detail code="1">Invalid Username or Password</error_detail>
<error_detail code="2">No username or password</error_detail>
<error_detail code="3">Session has expired</error_detail>
<error_detail code="4">Date of effectivity cannot be less than</error_detail>
</error>

How can I get the "session has expired" using xpath?

I tried:

$xml   = simplexml_load_string($xml_string);
$a     = $xml->xpath("//error_detail[@code='3']");
display_output($a);

I am getting this instead:

array ( 0 => SimpleXMLElement::__set_state(array( '@attributes' => array ( 'code' => '53', ), )), )

See stackoverflow.com/questions/23888679/…. Please upvote if helpful. — Marcus Rickert
– Marcus Rickert, Commented May 28, 2014 at 9:58

hek2mgl · Accepted Answer · 2014-05-28 10:16:12Z

1

The xpath query returns an array even if the query returns just a single element. You need to convert this first element to string in order to obtain the text value:

$xml   = simplexml_load_string($xml_string);
$a     = $xml->xpath("//error_detail[@code=3]");

// convert to string though . ''
var_dump($a[0] . ''); // string(19) "Session has expired"

answered May 28, 2014 at 10:16

hek2mgl

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