PHP Xpath check if node exist

Question

I've an XML ( $fileXML ) like:

<FatturaElettronicaHeader>
   <CedentePrestatore>
      <DatiAnagrafici>
        <Anagrafica>
          <Denominazione>MY STORE SRL</Denominazione>
          <Cognome>Rossi</Cognome>
        </Anagrafica>
      </DatiAnagrafici>
   </CedentePrestatore>
</FatturaElettronicaHeader>

I use this function to retrieve some values:

$xml = new DOMDocument();
$xml->loadXML($fileXML);
$xpath = new DOMXPath($xml);            
$nodes = $xpath->query('//CedentePrestatore/DatiAnagrafici');
foreach ($nodes as $nodelist) {

  $denominazione = $xpath->query( 'Anagrafica/Denominazione', $nodelist)->item(0)->nodeValue;
  $cognome = $xpath->query( 'Anagrafica/Cognome', $nodelist)->item(0)->nodeValue;

}

It work great. But node Cognome is optional in the XML, so sometimes it doesn't exist, like:

<FatturaElettronicaHeader>
   <CedentePrestatore>
      <DatiAnagrafici>
        <Anagrafica>
          <Denominazione>MY SHOP2 SRL</Denominazione>
        </Anagrafica>
      </DatiAnagrafici>
   </CedentePrestatore>
</FatturaElettronicaHeader>

Then my script get error: Trying to get property of non-object

How can I modify my code to assign at variable $cognome node value if exist, empty string "" in other cases?

Which of these lines shows the problem? Why not check whether an object is returned by any of these method calls or not? — Nico Haase
– Nico Haase, Commented Feb 6, 2019 at 9:42
$cognome = $xpath->query( 'Anagrafica/Cognome', $nodelist)->item(0)->nodeValue; when use the second XML example, where Cognome is not present — Giuseppe Lodi Rizzini
– Giuseppe Lodi Rizzini, Commented Feb 6, 2019 at 9:43
And why not check whether $xpath->query( 'Anagrafica/Cognome', $nodelist)->item(0) is an object or not? — Nico Haase
– Nico Haase, Commented Feb 6, 2019 at 9:44

splash58 · Accepted Answer · 2019-02-06 09:44:36Z

4

Chech that xpath returns any node

$cognome = $xpath->query( 'Anagrafica/Cognome', $nodelist);
$cognome = $cognome->length ? $cognome->item(0)->nodeValue : '';

answered Feb 6, 2019 at 9:44

splash58

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