PHP中DOM操作

参考链接： php中$与$$

一个简单的例子 

<?php

//初始化一个DOMDocument

$xml = new DOMDocument('1.0','UTF-8');

//创建一个tag名为people的Element，并添加到DOMDocument中

$people = $xml->createElement('people');

$xml->appendChild($people);

//创建一个tag名为person、值为lily、并带有一个属性id=101的Element，最后添加到people的Element中

$person1 = $xml->createElement('person','lily');

$people->appendChild($person1);

$person1->setAttribute('id',101);

//创建一个tag名为person、值为lucy、并带有一个属性id=102的Element，最后添加到people的Element中

$person2 = $xml->createElement('person','lucy');

$people->appendChild($person2);

$person2->setAttribute('id',102);

echo $xml->saveXML(); 

创建结点 

CDATASection、Comment、TextNode 

<?php

$xml = new DOMDocument('1.0','UTF-8');

$people = $xml->createElement('people');

$xml->appendChild($people);

$person1 = $xml->createElement('person');

$people->appendChild($person1);

$person1->setAttribute('id',101);

$name = $xml->createElement('name','lily');

$person1->appendChild($name);

//CDATA

$cdata = $xml->createCDATASection('cdata cdata cdata cdata');

$person1->appendChild($cdata);

//评论

$comment = $xml->createComment('comment comment comment');

$person1->appendChild($comment);

//文本

$textNode = $xml->createTextNode('text text text text');

$person1->appendChild($textNode);

$person2 = $xml->createElement('person');

$people->appendChild($person2);

$person2->setAttribute('id',102);

$name = $xml->createElement('name','lucy');

$person2->appendChild($name);

$xml->save('1.xml');

echo $xml->saveXML(); 

查找 

getElementById，通过ID查找一个getElementByTagName，通过tag名称查找多个 

getElementById 有坑 

$xml = new DOMDocument();

$xml->load('1.xml');

$nodeList = $xml->getElementsByTagName('person');

foreach ($nodeList as $node){

    /** @var DOMNode $node */

    echo $node->getNodePath()."\n";

}

输出

/people/person[1]

/people/person[2] 

读取 

loadXML，从字符串中读取XMLload, 从文件中读取XMLloadHTML，从字符串中读取HTMLloadHTMLFile，从文件中读取HTML 

例子 

$xml = new DOMDocument();

$xml->load('1.xml');

echo $xml->saveXML(); 

保存 

$xml->save(‘out.xml’) 

输出结果到文件中 

<?xml version="1.0" encoding="UTF-8"?>

<people><person id="101">lily</person><person id="102">lucy</person></people> 

echo $xml->saveXML() 

输出结果到控制台中 

<?xml version="1.0" encoding="UTF-8"?>

<people><person id="101">lily</person><person id="102">lucy</person></people> 

echo $xml->saveHTML() 

输出结果到控制台中 

<people><person id="101">lily</person><person id="102">lucy</person></people> 

echo $xml->saveHTMLFile(‘out.html’) 

输出结果到文件中 

<people><person id="101">lily</person><person id="102">lucy</person></people> 

参考 

The DOMDocument class