通过标签名称获取XML元素

Question

var_dump($object) outputs the following result:

object(stdClass)#9 (5) {
    ["data"]=>  object(stdClass)#8 {
        ["validFiling"]=>  object(stdClass)#7 {
                ["indicators"]=>  string(6) "MODE_S"
        }
        ["plan"]=>  object(stdClass)#6 {
            ["id"]=>  string(10) "xxx"
        }
    }
}

In this data structure I need to access the content of the field id . I do this in the following way:

try
{
  $object =   $client->getPlan($p);
  var_dump($object);
}
  catch (Exception $e) {
  print $e->getMessage();
}

$line = $client->getLastResponse();

$doc = new DOMDocument();
$doc->loadXML($line);
$data = $doc->getElementsByTagName('data');
$fp = $data->getElementsByTagName('plan');
$id = $fp->getElementsByTagName('id');
$fId = $id->item(0)->nodeValue;

And the error is (at the line $fp = $data->getElementsByTagName('plan') ):

Call to undefined method DOMNodeList::getElementsByTagName()

How to solve this issue?

Answer 1

The error occurs because $data is a DOMNodeList which doesn't have the getElementsByTagName() method. You have the same problem with the $fp variable. If you want to access the first data element found, then change to:

$data = $doc->getElementsByTagName('data')->item(0);
$fp = $data->getElementsByTagName('plan')->item(0);
$id = $fp->getElementsByTagName('id');

Or if you want to iterate of the data elements and apply the processing to each:

$dataList = $doc->getElementsByTagName('data');

foreach($dataList as $data)
{
    $fp = $data->getElementsByTagName('plan')->item(0);
    $id = $fp->getElementsByTagName('id');
    $fId = $id->item(0)->nodeValue;
}

The above works because its calling getElementsByTagName() on the node itself not the list.