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PHP读写XML文件技巧

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Release: 2016-06-13 11:33:38
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 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

$rootelement =$dom->createElement("article");

$title =$dom->createElement("title", "PHP访问MySql数据库 初级篇");

然后创建带文本内容的结点

$link =$dom->createElement("link","http://blog.csdn.net/morewindows/article/details/7102362");

也可以先生成结点再为其添加文本内容。

$link = $dom->createElement("link");

$linktext =$dom->createTextNode('http://blog.csdn.net/morewindows/article/details/7102362');

$link->appendChild($linktext);

然后将

和<link>结点加入到<article>结点中去 <p>$rootelement->appendChild($title);</p> <p>$rootelement->appendChild($link);</p> <p>最后将<article>结点加入到DOMDocument对象中,</article></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);就只会输出<link>结点:<link>http://blog.csdn.net/morewindows/article/details/7102362</p> <p>下面再给出一个完整的PHP中数据内容输出到XML文件的例子。该例子会对将一个PHP数组输出到XML文件中。</p> <p>[php] <?php <br /> //将数组输出到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<article>结点 <br> $articles = $dom->getElementsByTagName("article"); <br> echo '<article> 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> //输出结果 <br> echo "<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"; <br> var_dump($article_array); <br> echo "</pre><div class="contentsignin">Copy after login</div></div>"; <br> ?> <br> <?php <br /> //读取XML文件<br> // by MoreWindows( http://blog.csdn.net/MoreWindows )<br> $filename = "D:test.xml";<br> $article_array = array();</article></article></p> <p> </p> <p>$dom = new DOMDocument('1.0', 'UTF-8');<br> $dom->load($filename);</p> <p>//得到<article>结点<br> $articles = $dom->getElementsByTagName("article");<br> echo '<article> 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> }</article></article></p> <p>//输出结果<br> echo "</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">";<br> var_dump($article_array);<br> echo "</pre><div class="contentsignin">Copy after login</div></div>";<br> ?> </article>
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