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PHP读写XML文件技巧

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Jun 13, 2016 am 11:33 AM

char header html php text xml Commonly used Skill document Read and write

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

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 $rootelement->appendChild($title); $rootelement->appendChild($link); 最后将<article>结点加入到DOMDocument对象中，</article> $dom->appendChild($rootelement); 这样一个完整的XML就生成完毕了。再整出整个XML， echo $dom->saveXML() ; 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 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。 [php] <?php //将数组输出到XML文件中 // by MoreWindows( http://blog.csdn.net/MoreWindows ) $article_array = array( "第一篇" => array( "title"=>"PHP访问MySql数据库初级篇", "link"=>"http://blog.csdn.net/morewindows/article/details/7102362" ), "第二篇" => array( "title"=>"PHP访问MySql数据库中级篇 Smarty技术", "link"=>"http://blog.csdn.net/morewindows/article/details/7094642" ), "第三篇" => array( "title"=>"PHP访问MySql数据库高级篇 AJAX技术", "link"=>"http://blog.csdn.net/morewindows/article/details/7086524" ), ); $dom = new DOMDocument('1.0', 'UTF-8'); $dom->formatOutput = true; $rootelement = $dom->createElement("MoreWindows"); foreach ($article_array as $key=>$value) { $article = $dom->createElement("article", $key); $title = $dom->createElement("title", $value['title']); $link = $dom->createElement("link", $value['link']); $article->appendChild($title); $article->appendChild($link); $rootelement->appendChild($article); } $dom->appendChild($rootelement); $filename = "D:test.xml"; echo 'XML文件大小' . $dom->save($filename) . '字节'; ?> <?php //将数组输出到XML文件中 // by MoreWindows( http://blog.csdn.net/MoreWindows ) $article_array = array( "第一篇" => array( "title"=>"PHP访问MySql数据库初级篇", "link"=>"http://blog.csdn.net/morewindows/article/details/7102362" ), "第二篇" => array( "title"=>"PHP访问MySql数据库中级篇 Smarty技术", "link"=>"http://blog.csdn.net/morewindows/article/details/7094642" ), "第三篇" => array( "title"=>"PHP访问MySql数据库高级篇 AJAX技术", "link"=>"http://blog.csdn.net/morewindows/article/details/7086524" ), ); $dom = new DOMDocument('1.0', 'UTF-8'); $dom->formatOutput = true; $rootelement = $dom->createElement("MoreWindows"); foreach ($article_array as $key=>$value) { $article = $dom->createElement("article", $key); $title = $dom->createElement("title", $value['title']); $link = $dom->createElement("link", $value['link']); $article->appendChild($title); $article->appendChild($link); $rootelement->appendChild($article); } $dom->appendChild($rootelement); $filename = "D:test.xml"; echo 'XML文件大小' . $dom->save($filename) . '字节'; ?> 运行该PHP会在D盘上生成test.xml文件(Win7 + XAMPP + IE9.0测试通过) 二．读取XML文件 以读取前文中生成的D:test.xml为例： [php] <?php //读取XML文件 // by MoreWindows( http://blog.csdn.net/MoreWindows ) $filename = "D:test.xml"; $article_array = array(); $dom = new DOMDocument('1.0', 'UTF-8'); $dom->load($filename); //得到<article>结点 $articles = $dom->getElementsByTagName("article"); echo '<article> 结点个数 ' . $articles->length; foreach ($articles as $article) { $id = $article->getElementsByTagName("id")->item(0)->nodeValue; $title = $article->getElementsByTagName("title")->item(0)->nodeValue; $link = $article->getElementsByTagName("link")->item(0)->nodeValue; $article_array[$id] = array('title'=>$title, 'link'=>$link); } //输出结果 echo "<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"; var_dump($article_array); echo "</pre><div class="contentsignin">Copy after login</div></div>"; ?> <?php //读取XML文件 // by MoreWindows( http://blog.csdn.net/MoreWindows ) $filename = "D:test.xml"; $article_array = array();</article></article> $dom = new DOMDocument('1.0', 'UTF-8'); $dom->load($filename); //得到<article>结点 $articles = $dom->getElementsByTagName("article"); echo '<article> 结点个数 ' . $articles->length; foreach ($articles as $article) { $id = $article->getElementsByTagName("id")->item(0)->nodeValue; $title = $article->getElementsByTagName("title")->item(0)->nodeValue; $link = $article->getElementsByTagName("link")->item(0)->nodeValue; $article_array[$id] = array('title'=>$title, 'link'=>$link); }</article></article> //输出结果 echo " <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"; var_dump($article_array); echo "</pre><div class="contentsignin">Copy after login</div></div>"; ?> </article>

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