详解PHP原生DOM对象操作XML的方法

$info = array(
array('obj' => 'power','info' => 'power is shutdown'),array('obj' => 'memcache','info' => 'memcache used than 90%'),array('obj' => 'cpu','info' => 'cpu used than 95%'),array('obj' => 'disk','info' => 'disk is removed')
);//用来写入的数据

$dom = new DOMDocument('1.0');
$dom->formatOutput = true;//格式化

$eventList = $dom->createElement('EventList');//创建根节点EventList
$dom->appendChild($eventList);//添加根节点

for($i = 0; $i < count($info); $i++){
$event = $dom->createElement('event');//创建节点event
$text = $dom->createTextNode('PHP'.$i);//创建文本节点，值为PHP0,PHP1...
$event->appendChild($text);//将文本节点添加到节点event，做为节点event的值

$attr_obj = $dom->createAttribute('obj');//创建属性obj
$attr_obj->value = $info[$i]['obj'];//为obj属性赋值
$event->appendChild($attr_obj);//将obj属性添加到event节点中，做为event节点的属性

$attr_info = $dom->createAttribute('info');
$attr_info->value = $info[$i]['info'];
$event->appendChild($attr_info);

$eventList->appendChild($event);//将event节点添加到根节点EventList中
}

//echo $dom->saveXML();
$dom->save('./t.xml');//保存信息到当前目录下的t.xml文件中

$dom = new DOMDocument('1.0');
$dom->load('./t.xml');//加载要操作的文件
$list = $dom->getElementsByTagName('event');//获取event节点列表
foreach($list as $item){
$attr_obj = $item->getAttribute('obj');//获取属性obj的值
$attr_info = $item->getAttribute('info');
echo "

Object:$attr_obj;Info:$attr_info;Value:{$item->nodeValue}

";
$item->setAttribute('count',1);//添加新的属性count=1
}
$dom->save('./t.xml');//保存修改

Object:memcache;Info:memcache used than 90%;Value:PHP1

Object:cpu;Info:cpu used than 95%;Value:PHP2

Object:disk;Info:disk is removed;Value:PHP3

$dom = new DOMDocument('1.0');
$dom->load('./t.xml');
$list = $dom->getElementsByTagName('event');
foreach($list as $item){
$attr_obj = $item->getAttribute('obj');
if($attr_obj == 'cpu'){//修改cpu的count属性，使其值+1
$attr_count = $item->getAttribute('count');//获取count属性的值
$item->setAttribute('count',$attr_count+1);//重置count属性的值
$item->nodeValue = 'Hello,Kitty';//重置节点的值
}
}
$dom->save('./t.xml');

$dom = new DOMDocument('1.0');
$dom->load('./t.xml');
$list = $dom->getElementsByTagName('event');
foreach($list as $item){
if($item->getAttribute('obj') == 'disk'){//以obj=disk的节点为操作对象
$item->parentNode->removeChild($item);//删除节点
}
}
$dom->save('./t.xml');

$dom = new DOMDocument('1.0');
$dom->load('./t.xml');
$event_list = $dom->getElementsByTagName('EventList');//获取根节点
$event = $dom->createElement('event','lenovo');//新建节点
$event_list->item(0)->appendChild($event);//将新建节点添加到根节点中

$event_attr_obj = $dom->createAttribute('obj');
$event_attr_obj->value = 'lenovo';
$event->appendChild($event_attr_obj);

$event_attr_info = $dom->createAttribute('info');
$event_attr_info->value = 'thinkpad t430';
$event->appendChild($event_attr_info);

$dom->save('./t.xml');

<event obj="lenovo" info="thinkpad t430">lenovo

string(5) "event" ["schemaTypeInfo"]=> NULL ["nodeName"]=> string(5) "event" ["nodeValue"]=> string(11) "Hello,Kitty" ["nodeType"]=> int(1) ["parentNode"]=> string(22) "(object value omitted)" ["childNodes"]=> string(22) "(object value omitted)" ["firstChild"]=> string(22) "(object value omitted)" ["lastChild"]=> string(22) "(object value omitted)" ["previousSibling"]=> string(22) "(object value omitted)" ["nextSibling"]=> string(22) "(object value omitted)" ["attributes"]=> string(22) "(object value omitted)" ["ownerDocument"]=> string(22) "(object value omitted)" ["namespaceURI"]=> NULL ["prefix"]=> string(0) "" ["localName"]=> string(5) "event" ["baseURI"]=> string(36) "file:/H:/xampp/htdocs/demo/xml/t.xml" ["textContent"]=> string(11) "Hello,Kitty" }

load('./t.xml'); $e = $dom->getElementsByTagName('event'); echo $e->item(2)->nodeValue; //var_dump($e->item(2)); // $e = $dom->getElementsByTagName('EventList'); // var_dump($e->item(0)); //var_dump($e->item(0)->baseURI); // for($i=0;$i<$e->length;$i++){ // echo $e->item($i)->nodeValue; // }