<?php 
//创建一个新的DOM文档 
$dom = new DomDocument(); 
//在根节点创建departs标签 
$departs = $dom->createElement('departs'); 
$dom->appendChild($departs); 
//在departs标签下创建depart子标签 
$depart = $dom->createElement('depart'); 
$departs->appendChild($depart); 
//在depart标签下创建employees子标签 
$employees = $dom->createElement('employees'); 
$depart->appendChild($employees); 
//在employees标签下创建employee子标签 
$employee = $dom->createElement('employee'); 
$employees->appendChild($employee); 
//在employee标签下创建serial_no子标签 
$serial_no = $dom->createElement('serial_no'); 
$employee->appendChild($serial_no); 
//为serial_no标签添加值节点100001 
$serial_no_value = $dom->createTextNode('100001'); 
$serial_no->appendChild($serial_no_value); 
//输出XML数据 
echo $dom->saveXML(); 
?> 

<?php 
$dom = new DomDocument(); //创建DOM对象 
$dom->load('example.xml'); //读取XML文件 
$root = $dom->documentElement; //获取XML数据的根 
read_child($root); //调用read_child函数读取根对象 

function read_child($node) 
{ 
$children = $node->childNodes; //获得$node的所有子节点 

foreach($children as $e) //循环读取每一个子节点 
{ 
if($e->nodeType == XML_TEXT_NODE) //如果子节点为文本型则输出 
{ 
echo $e->nodeValue."<BR>"; 
} 
else if($e->nodeType == XML_ELEMENT_NODE) //如果子节点为节点对象，则调用函数处理 
{ 
read_child($e); 
} 
} 
} 
?>