How can PHP automatically close opened XML tags to ensure conformity when storing data in a database?

When storing data in a database, it is important to ensure that the XML being stored is well-formed. One common issue is forgetting to close opened XML tags, which can result in invalid XML. To automatically close opened XML tags in PHP, you can use the `SimpleXMLElement` class, which automatically handles the creation of well-formed XML.

$xml = new SimpleXMLElement('<data></data>');
$xml->addChild('name', 'John');
$xml->addChild('age', 30);

echo $xml->asXML();