常用 如下 几行：
header("content-type:text/html; charset=utf-8"); //指定PHP使用UTF-8编码
$xml = simplexml_load_file("example.xml"); //读取xml文件
$newxml = $xml->asXML(); //标准化$xml
$fp = fopen("newxml.xml", "w"); //新建xml文件
fwrite($fp, $newxml); //写入-------xml文件
fclose($fp);
PHP可以方便的生成和读取XML文件。PHP主要通过DOMDocument、DOMElement和DOMNodeList来完成XML的读取与写入操作的。下面就简要说明下如何使用这些类。
一．生成XML文件
对于一个如下XML文件。
[html]
PHP访问MySql数据库 初级篇
http://blog.csdn.net/morewindows/article/details/7102362
PHP访问MySql数据库 初级篇
http://blog.csdn.net/morewindows/article/details/7102362
我们来看看如何用PHP来生成：
首先new一个DOMDocument对象并设置编码格式。
$dom = newDOMDocument('1.0', 'UTF-8');
$dom->formatOutput= true;
再创建结点和
结点</p>
<p>$rootelement =$dom->createElement("article");</p>
<p>$title =$dom->createElement("title", "PHP访问MySql数据库 初级篇");</p>
<p>然后创建带文本内容的结点</p>
<p>$link =$dom->createElement("link","http://blog.csdn.net/morewindows/article/details/7102362");</p>
<p>也可以先生成结点再为其添加文本内容。</p>
<p>$link = $dom->createElement("link");</p>
<p>$linktext =$dom->createTextNode('http://blog.csdn.net/morewindows/article/details/7102362');</p>
<p>$link->appendChild($linktext);</p>
<p>然后将<title>和结点加入到结点中去</p>
<p>$rootelement->appendChild($title);</p>
<p>$rootelement->appendChild($link);</p>
<p>最后将结点加入到DOMDocument对象中，</p>
<p>$dom->appendChild($rootelement);</p>
<p>这样一个完整的XML就生成完毕了。再整出整个XML，</p>
<p>echo $dom->saveXML() ;</p>
<p>saveXML()也可以只输入部分XML文本，如echo $dom->saveXML($link);就只会</pre>输出结点：http://blog.csdn.net/morewindows/article/details/7102362</link></p>
<p>下面再给出一个完整的PHP中数据内容</pre>输出到XML文件的例子。该例子会对将一个PHP数组</pre>输出到XML文件中。</p>
<p>[php] <?php <br />
//将数组</pre>输出到XML文件中 <br />
// by MoreWindows( http://blog.csdn.net/MoreWindows ) <br />
$article_array = array( <br />
"第一篇" => array( <br />
"title"=>"PHP访问MySql数据库 初级篇", <br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7102362" <br />
), <br />
"第二篇" => array( <br />
"title"=>"PHP访问MySql数据库 中级篇 Smarty技术", <br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7094642" <br />
), <br />
"第三篇" => array( <br />
"title"=>"PHP访问MySql数据库 高级篇 AJAX技术", <br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7086524" <br />
), <br />
); <br />
$dom = new DOMDocument('1.0', 'UTF-8'); <br />
$dom->formatOutput = true; <br />
$rootelement = $dom->createElement("MoreWindows"); <br />
foreach ($article_array as $key=>$value) <br />
{ <br />
$article = $dom->createElement("article", $key); <br />
$title = $dom->createElement("title", $value['title']); <br />
$link = $dom->createElement("link", $value['link']); <br />
$article->appendChild($title); <br />
$article->appendChild($link); <br />
$rootelement->appendChild($article); <br />
</p>
<p>} <br />
$dom->appendChild($rootelement); <br />
$filename = "D:test.xml"; <br />
echo 'XML文件大小' . $dom->save($filename) . '字节'; <br />
?> <br />
<?php<br />
//将数组</pre>输出到XML文件中<br />
// by MoreWindows( http://blog.csdn.net/MoreWindows )<br />
$article_array = array(<br />
"第一篇" => array(<br />
"title"=>"PHP访问MySql数据库 初级篇",<br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7102362"<br />
),<br />
"第二篇" => array(<br />
"title"=>"PHP访问MySql数据库 中级篇 Smarty技术",<br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7094642"<br />
),<br />
"第三篇" => array(<br />
"title"=>"PHP访问MySql数据库 高级篇 AJAX技术",<br />
"link"=>"http://blog.csdn.net/morewindows/article/details/7086524"<br />
),<br />
);<br />
$dom = new DOMDocument('1.0', 'UTF-8');<br />
$dom->formatOutput = true;<br />
$rootelement = $dom->createElement("MoreWindows");<br />
foreach ($article_array as $key=>$value)<br />
{<br />
$article = $dom->createElement("article", $key);<br />
$title = $dom->createElement("title", $value['title']);<br />
$link = $dom->createElement("link", $value['link']);<br />
$article->appendChild($title);<br />
$article->appendChild($link);<br />
$rootelement->appendChild($article);<br />
}<br />
$dom->appendChild($rootelement);<br />
$filename = "D:test.xml";<br />
echo 'XML文件大小' . $dom->save($filename) . '字节';<br />
?><br />
运行该PHP会在D盘上生成test.xml文件(Win7 + XAMPP + IE9.0测试通过)</p>
<p> </p>
<p>二．读取XML文件 <br />
以读取前文中生成的D:test.xml为例：</p>
<p>[php] <?php <br />
//读取XML文件 <br />
// by MoreWindows( http://blog.csdn.net/MoreWindows ) <br />
$filename = "D:test.xml"; <br />
$article_array = array(); <br />
<br />
$dom = new DOMDocument('1.0', 'UTF-8'); <br />
$dom->load($filename); <br />
<br />
//得到结点 <br />
$articles = $dom->getElementsByTagName("article"); <br />
echo ' 结点个数 ' . $articles->length; <br />
foreach ($articles as $article) <br />
{ <br />
$id = $article->getElementsByTagName("id")->item(0)->nodeValue; <br />
$title = $article->getElementsByTagName("title")->item(0)->nodeValue; <br />
$link = $article->getElementsByTagName("link")->item(0)->nodeValue; <br />
$article_array[$id] = array('title'=>$title, 'link'=>$link); <br />
} <br />
<br />
//</pre>输出结果 <br />
echo "<pre class="brush:php;toolbar:false">"; <br />
var_dump($article_array); <br />
echo "</pre>"; <br />
?> <br />
<?php<br />
//读取XML文件<br />
// by MoreWindows( http://blog.csdn.net/MoreWindows )<br />
$filename = "D:test.xml";<br />
$article_array = array();</p>
<p> </p>
<p>$dom = new DOMDocument('1.0', 'UTF-8');<br />
$dom->load($filename);</p>
<p>//得到结点<br />
$articles = $dom->getElementsByTagName("article");<br />
echo ' 结点个数 ' . $articles->length;<br />
foreach ($articles as $article)<br />
{<br />
$id = $article->getElementsByTagName("id")->item(0)->nodeValue;<br />
$title = $article->getElementsByTagName("title")->item(0)->nodeValue;<br />
$link = $article->getElementsByTagName("link")->item(0)->nodeValue;<br />
$article_array[$id] = array('title'=>$title, 'link'=>$link);<br />
}</p>
<p>//</pre>输出结果<br />
echo "<pre class="brush:php;toolbar:false">";<br />
var_dump($article_array);<br />
echo "</pre>";<br />
?></p></p>
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