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Tips for reading and writing XML files with PHP_PHP tutorial

WBOY
WBOYOriginal
2016-07-20 11:18:011249browse

Commonly used lines are as follows:

header("content-type:text/html; charset=utf-8"); //Specify PHP to use UTF-8 encoding
$xml = simplexml_load_file("example.xml"); //Read xml file
$newxml = $xml->asXML(); //Standardize $xml
$fp = fopen("newxml.xml", "w"); //New xml file
fwrite($fp, $newxml); //Write -------xml file
fclose($fp);

PHP can easily generate and read XML files. PHP mainly completes XML reading and writing operations through DOMDocument, DOMElement and DOMNodeList. Below is a brief explanation of how to use these classes.

1. Generate XML file
For an XML file as follows.

[html]


PHP Access MySql Database Basics
http://blog.csdn.net/morewindows/article/details/7102362



PHP Access MySql Database Basics
http://blog.csdn.net/morewindows/article/details/7102362

Let’s see how to generate it using PHP:

First create a new DOMDocument object and set the encoding format.

$dom = newDOMDocument('1.0', 'UTF-8');

$dom->formatOutput= true;

Create the

node and the node</p> <p>$rootelement =$dom->createElement("article");</p> <p>$title =$dom->createElement("title", "PHP Access MySql Database - Elementary");</p> <p>Then create a <link> node with text content</p> <p>$link =$dom->createElement("link","http://blog.csdn.net/morewindows/article/details/7102362");</p> <p>You can also generate a <link> node first and then add text content to it. </p> <p>$link = $dom->createElement("link");</p> <p>$linktext =$dom->createTextNode('http://blog.csdn.net/morewindows/article/details/7102362');</p> <p>$link->appendChild($linktext);</p> <p>Then add the <title> and <link> nodes to the <article> node </p> <p>$rootelement->appendChild($title);</p> <p>$rootelement->appendChild($link);</p> <p>Finally, add the <article> node to the DOMDocument object, </p> <p>$dom->appendChild($rootelement);</p> <p>A complete XML is now generated. Then regenerate the entire XML, </p> <p>echo $dom->saveXML() ;</p> <p>saveXML() can also input only part of the XML text. For example, echo $dom->saveXML($link); will only output the <link> node: <link>http://blog.csdn. net/morewindows/article/details/7102362</link></p> <p>The following is a complete example of outputting data content to an XML file in PHP. This example will output a PHP array to an XML file. </p> <p>[php] <?php <br /> //Output the array to an XML file <br /> // by MoreWindows( http://blog.csdn.net/MoreWindows ) <br /> $article_array = array( <br /> "First article" => array( <br /> "title"=>"PHP Access MySql Database Beginner", <br> "link"=>"http://blog.csdn.net/morewindows/article/details/7102362" <br> ), <br> "Second article" => array( <br> "title"=>"PHP Access MySql Database Intermediate Smarty Technology", <br> "link"=>"http://blog.csdn.net/morewindows/article/details/7094642" <br> ), <br> "Part 3" => array( <br> "title"=>"PHP Access MySql Database Advanced AJAX Technology", <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 file size' . $dom->save($filename) . 'Bytes'; <br> ?> <br> <?php<br /> //Output the array to an XML file <br /> // by MoreWindows( http://blog.csdn.net/MoreWindows )<br /> $article_array = array(<br /> "First article" => array(<br /> "title"=>"PHP Access MySql Database Beginner",<br> "link"=>"http://blog.csdn.net/morewindows/article/details/7102362"<br> ),<br> "Second article" => array(<br> "title"=>"PHP Access MySql Database Intermediate Smarty Technology",<br> "link"=>"http://blog.csdn.net/morewindows/article/details/7094642"<br> ),<br> "Part 3" => array(<br> "title"=>"PHP Access MySql Database Advanced AJAX Technology",<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 file size' . $dom->save($filename) . 'Bytes';<br> ?><br> Running this PHP will generate the test.xml file on the D drive (Win7 + XAMPP + IE9.0 test passed) </p> <p> </p> <p>2. Read XML file <br> Take reading the D:test.xml generated in the previous article as an example: </p> <p>[php] <?php <br /> //Read XML file <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> //Get the <article> node <br> $articles = $dom->getElementsByTagName("article"); <br> echo '<article> Number of nodes' . $articles->length; <br> foreach ($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> //Output results <br> echo "<pre class="brush:php;toolbar:false">"; <br> var_dump($article_array); <br> echo "</pre>"; <br> ?> <br> <?php<br /> //Read XML file<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>//Get<article>node<br> $articles = $dom->getElementsByTagName("article");<br> echo '<article> Number of nodes' . $articles->length;<br> foreach ($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>//Output results<br> echo "<pre class="brush:php;toolbar:false">";<br> var_dump($article_array);<br> echo "</pre>";<br> ?></p> <p align="left"></p> <div style="display:none;"> <span id="url" itemprop="url">http://www.bkjia.com/PHPjc/371866.html</span><span id="indexUrl" itemprop="indexUrl">www.bkjia.com</span><span id="isOriginal" itemprop="isOriginal">true</span><span id="isBasedOnUrl" itemprop="isBasedOnUrl">http: //www.bkjia.com/PHPjc/371866.html</span><span id="genre" itemprop="genre">TechArticle</span><span id="description" itemprop="description">The following lines are commonly used: header(content-type:text/html; charset=utf-8); // Specify PHP to use UTF-8 encoding $xml = simplexml_load_file(example.xml); //Read xml file $newxml = $xml-asXML(...</span> </div> <div class="art_confoot"></div></div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement:</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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