PHP를 사용하여 XML 파일에서 CRUD 작업을 수행하는 방법은 무엇입니까?

// Create a new SimpleXMLElement object from scratch
$config = new SimpleXmlElement('<settings/>');

// Add a new setting with a key and value
$config->addChild('setting1', 'setting1 value');

// Save the updated XML to a file
$config->saveXML('config.xml');

// Load the XML file into a SimpleXMLElement object
$config = new SimpleXmlElement('config.xml');

// Get the value of a specific setting
$setting1Value = $config->setting1;

// Print the entire XML structure
echo $config->asXML();

// Load the XML file into a SimpleXMLElement object
$config = new SimpleXmlElement('config.xml');

// Update the value of a specific setting
$config->setting1 = 'new setting1 value';

// Save the updated XML to a file
$config->saveXML('config.xml');

// Print the updated XML structure
echo $config->asXML();

// Load the XML file into a SimpleXMLElement object
$config = new SimpleXmlElement('config.xml');

// Remove a specific setting by unsetting it
unset($config->setting1);

// Set another setting to null to effectively delete it
$config->setting2 = null;

// Save the updated XML to a file
$config->saveXML('config.xml');

// Print the updated XML structure
echo $config->asXML();

// Delete the XML file
unlink('config.xml');