Every time I attempt to XPath-query a recently created node, I encounter the message
PHP Notice: Trying to get property of non-object in ...The structure of my XML file is as follows:
<products xmlns='http://example.com/products'>
<product id='1'>
<name>Product name</name>
</product>
</products>
In my PHP code, I use XPath to retrieve an existing <product> and then another query for its <name>, which functions properly.
However, when I add a new <product> with a child <name> element to the root DOM and execute the second query on the newly added elements, retrieving the attribute works fine. But the second query, which should obtain the value of the first child <name>, fails with the PHP Notice
Trying to get property of non-object in ...$xmlFile = __DIR__ . '/products.xml';
$xml = new DOMDocument();
$xml->load($xmlFile);
$xml->formatOutput = true;
$xpath = new DOMXPath($xml);
$xpath->registerNamespace('p', $xml->lookupNamespaceUri($xml->namespaceURI));
$product1 = Product::$xpath->query("//p:product[@id=1]")->item(0);
$product1Id = $product1->attributes->getNamedItem('id')->nodeValue;
$product1Name = $xpath->query("p:name", $product1)->item(0)->nodeValue;
$product2Node = $xml->createElement('product');
$product2Node->setAttribute('id', '2');
$product2NameNode = $xml->createElement('name', 'Test');
$product2Node->appendChild($product2NameNode);
$product2 = $xml->documentElement->appendChild($product2Node);
$product2Id = $product2->attributes->getNamedItem('id')->nodeValue;
$product2Name = $xpath->query("p:name", $product2)->item(0)->nodeValue;
$xml->save($xmlFile);
Upon execution of the PHP script, the XML displays correctly:
<products xmlns='http://example.com/products'>
<product id='1'>
<name>Product name</name>
</product>
<product id='2'>
<name>Test</name>
</product>
</products>
I am currently facing a roadblock with this issue. I have attempted various solutions such as saving the XML before querying, reloading the XML post-saving, recreating the XPath object, etc.