PHP Read and write XML file tips _php Tutorial

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"); Reading an XML file
$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. Below is a brief description of how these classes are used.

A Generating an XML file
For one of the following XML files.

[HTML]

PHP access MySQL Database primary article
http://blog.csdn.net/morewindows/article/details/7102362



PHP access MySQL Database primary article
http://blog.csdn.net/morewindows/article/details/7102362

Let's see how PHP can be used to generate:

Start with a new DOMDocument object and set the encoding format.

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

$dom->formatoutput= true;

Then create the node andJunction </p>

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

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

Then create a node with text content

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

You can also create nodes before adding text to them.

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

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

$link->appendchild ($linktext);

Then theAnd Nodes are added to the node.

$rootelement->appendchild ($title);

$rootelement->appendchild ($link);

Finally, the nodes are 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 some XML text, such as Echo $dom->savexml ($link); only output nodes: http://blog.csdn.net/morewindows/article /details/7102362

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

[PHP] Outputting an array to an XML file
by Morewindows (http://blog.csdn.net/MoreWindows)
$article _array = Array (
"First article" = = Array (
"title" + "PHP access MySQL database primary article",
"Link" = "http://blog.csdn.net/morewindows/article/details/7102362"
),
"Second article" = = Array (
"title" = "PHP access MySQL database intermediate smarty Technology",
"Link" = "http://blog.csdn.net/morewindows/article/details/7094642"
),
"Third article" = = Array (
"title" = "PHP access 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). ' bytes ';
?>
Outputting an array to an XML file
by Morewindows (http://blog.csdn.net/MoreWindows)
$article _array = Array (
"First article" = = Array (
"title" + "PHP access MySQL database primary article",
"Link" = "http://blog.csdn.net/morewindows/article/details/7102362"
),
"Second article" = = Array (
"title" = "PHP access MySQL database intermediate smarty Technology",
"Link" = "http://blog.csdn.net/morewindows/article/details/7094642"
),
"Third article" = = Array (
"title" = "PHP access 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). ' bytes ';
?>
Running this PHP will generate the Test.xml file on the D drive (Win7 + XAMPP + IE9.0 test pass)

Two Reading an XML file
For example, read the d:test.xml generated in the previous article:

[PHP] Reading an 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 the knot.
$articles = $dom->getelementsbytagname ("article");
Echo ' 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 "

echo "

";
?>
Reading an 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 the knot.
$articles = $dom->getelementsbytagname ("article");
Echo ' 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 "

";
Var_dump ($article _array);
echo "

";
?>

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