PHP xml file operation implementation code (2)_PHP tutorial

//Create a new DOM document
$dom = new DomDocument();
//Create the departments tag at the root node
$departs = $dom->createElement('departs');
$dom->appendChild($departs);
//Create the department sub-tag under the departments tag
$depart = $dom->createElement('depart');
$departs->appendChild($depart);
//In department Create employees sub-tag under the tag
$employees = $dom->createElement('employees');
$depart->appendChild($employees);
//Create employees sub-tag under the employees tag Tag
$employee = $dom->createElement('employee');
$employees->appendChild($employee);
//Create serial_no sub-tag under employee tag
$ serial_no = $dom->createElement('serial_no');
$employee->appendChild($serial_no);
//Add value node 100001 for the serial_no tag
$serial_no_value = $dom-> ;createTextNode('100001');
$serial_no->appendChild($serial_no_value);
//Output XML data
echo $dom->saveXML();
?>

$dom = new DomDocument(); //Create DOM object
$dom->load('example.xml'); //Read XML file
$root = $dom->documentElement; //Get XML The root of the data
read_child($root); //Call the read_child function to read the root object

function read_child($node)
{
$children = $node->childNodes; //Get all child nodes of $node

foreach($children as $e) //Loop to read each child node
{
if($e->nodeType == XML_TEXT_NODE ) //If the child node is text type, output
{
echo $e->nodeValue."
";
}
else if($e->nodeType = = XML_ELEMENT_NODE) ​​//If the child node is a node object, call the function processing
{
read_child($e);
}
}
}
?>