一.使用DOM生成和读取XML文件
实例一：
复制代码 代码如下:
<？php
//Creates XML string and XML document using the DOM
$dom = new DomDocument（"1.0"）;
//add root - <books>
$books = $dom->appendChild（$dom->createElement_x_x （"books"））;
//add <book> element to <books>
$book = $books->appendChild（$dom->createElement_x_x （"book"））;
//add <title> element to <book>
$title = $book->appendChild（$dom->createElement_x_x （"title"））;
//add <title> text node element to <title>
$title->appendChild（$dom->createTextNode（"Great American Novel"））;
//generate xml
$dom->formatOutput = true; // set the formatOutput attribute of domDocument to true
//save XML as string or file
$test1 = $dom->saveXML（）; // put string in test1
$dom -> save（"test1.xml"）; // save as file
？>
实例二：
复制代码 代码如下:
$aa = "111";
$xmlstr = <<<XML
<？xml version="1.0"？>
<document>
<title>{$aa}</title>
<from>Joe</from>
<to>Jane</to>
<body>
I know that"s the answer -- but what"s the question？
</body>
</document>
XML;
$dom = new domDocument;
$dom->loadXML（$xmlstr）;
$test1 = $dom->saveXML（）;
$dom->save（"test1.xml"）;
实例三：
test1.xml:
复制代码 代码如下:
<？xml version="1.0"？>
<books>
<book>
<author>Jack Herrington</author>
<title>PHP Hacks</title>
<publisher>O"Reilly</publisher>
</book>
<book>
<author>Jack Herrington</author>
<title>Podcasting Hacks</title>
<publisher>O"Reilly</publisher>
</book>
</books>
example.php:
复制代码 代码如下:
$doc = new DOMDocument（）;
$doc->load（"test1.xml"）;
$books = $doc->getElementsByTagName（"book"）;
foreach（$books as $book）{
$authors = $book->getElementsByTagName（"author"）;
$author = $authors->item（0）->nodeValue;
$publishers = $book->getElementsByTagName（ "publisher" ）;
$publisher = $publishers->item（0）->nodeValue;
$titles = $book->getElementsByTagName（ "title" ）;
$title = $titles->item（0）->nodeValue;
echo "$title - $author - $publisher
";
}
二.使用simple生成和读取xml文件
实例一：
复制代码 代码如下:
<？
$xmlstr = <<<XML
<？xml version="1.0" standalone="yes"？>
<books>
<book>
<title>Great American Novel</title>
<characters>
<character>
<name>Cliff</name>
<desc>really great guy</desc>
</character>
<character>
<name>Lovely Woman</name>
<desc>matchless beauty</desc>
</character>
<character>
<name>Loyal Dog</name>
<desc>sleepy</desc>
</character>
</characters>
<plot>
Cliff meets Lovely Woman. Loyal Dog sleeps, but wakes up to bark
at mailman.
</plot>
<success type="bestseller">4</success>
<success type="bookclubs">9</success>
</book>
</books>
XML;
//提取节点内容
$xml = new SimpleXMLElement（$xmlstr）;
foreach （$xml->book[0]->success as $success） {
switch（（string） $success["type"]） { // Get attributes as element indices
case "bestseller":
echo $success. " months on bestseller list<br>";
break;
case "bookclubs":
echo $success. " bookclub listings";
break;
}
}
//修改文本节点内容
$xml = new SimpleXMLElement（$xmlstr）;
$xml->book[0]->characters->character[0]->name = "Big Cliff";
echo $xml->asXML（）;
//添加子元素的文本节点
$xml = new SimpleXMLElement（$xmlstr）;
$character = $xml->book[0]->characters->addChild（"character"）;
$character->addChild（"name", "Yellow Cat"）;
$character->addChild（"desc", "aloof"）;
$success = $xml->book[0]->addChild（"success", "2"）;
$success->addAttribute（"type", "reprints"）;
echo $xml->asXML（）;
？>
实例二：
复制代码 代码如下:
if （file_exists（"test1.xml"）） { //读取xml文件
$xml = simplexml_load_file（"test1.xml"）;
var_dump（xml）;
} else {
exit（"Failed to open test1.xml."）;
}
三.DOM和simple互操作
DOM导入simpleXML：
复制代码 代码如下:
<？php
$sxe = simplexml_load_string（"<books><book><title>Great American
Novel</title></book></books>"）;
if （$sxe === false） {
echo "Error while parsing the document";
exit;
}
$dom_sxe = dom_import_simplexml（$sxe）;
if （！$dom_sxe） {
echo "Error while converting XML";
exit;
}
$dom = new DOMDocument（"1.0"）;
$dom_sxe = $dom->importNode（$dom_sxe, true）;
$dom_sxe = $dom->appendChild（$dom_sxe）;
$test2 = $dom->saveXML（）; // put string in test2
$dom -> save（"test2.xml"）; // save as file
？>
simpleXML导入DOM：
复制代码 代码如下:
<？php
$dom = new domDocument;
$dom->loadXML（"<books><book><title>Great American
Novel</title></book></books>"）;
if （！$dom） {
echo "Error while parsing the document";
exit;
}
$s = simplexml_import_dom（$dom）;
echo $s->book[0]->title; // Great American Novel
？>
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