PHP Read and write XML file tips

The following lines are commonly used:

Header ("content-type:text/html; Charset=utf-8 "); Specifies that PHP uses UTF-8 encoding
$xml = simplexml_load_file ("Example.xml"); reading XML files
$newxml = $xml->asxml (); Standardized $xml
$fp = fopen ("Newxml.xml", "w"); New XML file
Fwrite ($fp, $newxml); Write-------XML file
Fclose ($FP);

PHP makes it easy to generate and read XML files. PHP mainly through the DOMDocument, DomElement and domnodelist to complete the XML read and write operations. Here's a brief description of how to use these classes.

A Generate XML file
For one of the following XML files.

[HTML] <?xml version= "1.0" encoding= "UTF-8"?>
<article>
<title>php Access MySQL database primary article </title>
<link>http://blog.csdn.net/morewindows/article/details/7102362</link>
</article>
<?xml version= "1.0" encoding= "UTF-8"?>
<article>
<title>php Access MySQL database primary article </title>
<link>http://blog.csdn.net/morewindows/article/details/7102362</link>
</article>
Let's take a look at how PHP is used to generate:

First the new DOMDocument object and set the encoding format.

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

$dom->formatoutput= true;

Re-create <article> nodes and <title> nodes.

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

$title = $dom->createelement ("title", "PHP access to MySQL database primary article");

Then create a <link> node with text content

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

You can also build <link> nodes and then add text content to them.

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

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

$link->appendchild ($linktext);

Then add the <title> and <link> nodes to the <article> node.

$rootelement->appendchild ($title);

$rootelement->appendchild ($link);

Finally, the <article> node is added to the DOMDocument object.

$dom->appendchild ($rootelement);

Such a complete XML is generated. And then complete the entire XML,

echo $dom->savexml ();

SaveXML () can also enter only part of the XML text, such as Echo $dom->savexml ($link), and only output <link> nodes: <link>http://blog.csdn.net/ Morewindows/article/details/7102362</link>

Here is a complete example of the output of data in PHP to an XML file. This example outputs a PHP array to an XML file.

[PHP] <?php
//Output the array to an XML file
//by Morewindows (http://blog.csdn.net/MoreWindows)
$article _array = arr Ay (
"first" => Array (
"title" => "PHP access to MySQL database", "
Link" => "http://blog.csdn.net/morewindows/ article/details/7102362 "
),
" second "=> Array (
" title "=>" PHP access to MySQL database Intermediate article smarty Technology ",
" link "=>" h ttp://blog.csdn.net/morewindows/article/details/7094642 "
),
" third "=> Array (
" title "=>") PHP access to MySQL database advanced Ajax Technology ",
Link" => "http://blog.csdn.net/morewindows/article/details/7086524"
),
); br> $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 file Size '. $dom->save ($filename). ' Byte ';
?>
<?php
//Output the array to an XML file
//by Morewindows (http://blog.csdn.net/MoreWindows)
$article _array = Array (
First => Array (
"title" => "PHP access to MySQL database primary article",
Link "=>" http://blog.csdn.net/morewindows /article/details/7102362 "
),
" second "=> Array (
" title "=>" PHP access to MySQL database Intermediate article smarty Technology ",
" link "=> http://blog.csdn.net/morewindows/article/details/7094642 "
),
" third "=> Array (
" title "=>") PHP access to MySQL database advanced Ajax Technology ",
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 file Size '. $dom->save ($ filename). ' Byte ';

To run this PHP will generate Test.xml files on D disk (Win7 + XAMPP + IE9.0 test pass)

Two reading XML files
Take the d:test.xml generated in the previous reading as an example:

[PHP] <?php
//Read XML file
//by Morewindows (http://blog.csdn.net/MoreWindows)
$filename = "D:test.xml";
$article _array = Array ();

$dom = new DOMDocument (' 1.0 ', ' UTF-8 ');
$dom->load ($filename);

//Get <article> node
$articles = $dom->getelementsbytagname ("article");
Echo ' <article> number of nodes '. $articles->length;
foreach ($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);
}

//outputting results
echo "<pre>";
Var_dump ($article _array);
echo "</pre>";
?>
<?php
//Read XML file
//by Morewindows (http://blog.csdn.net/MoreWindows)
$filename = "D:test.x ML ";
$article _array = arRay ();

$dom = new DOMDocument (' 1.0 ', ' UTF-8 ');
$dom->load ($filename);

Get the <article> knots.
$articles = $dom->getelementsbytagname ("article");
Echo ' <article> number of nodes '. $articles->length;
foreach ($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);
}

Output results
echo "<pre>";
Var_dump ($article _array);
echo "</pre>";
?>