DOMDocument::save

(PHP 5, PHP 7)

DOMDocument::save — Dumps the internal XML tree back into a file

说明

public int DOMDocument::save ( string $filename [, int $options ] )

Creates an XML document from the DOM representation. This function is usually called after building a new dom document from scratch as in the example below.

参数

filename: The path to the saved XML document.
options: Additional Options. Currently only LIBXML_NOEMPTYTAG is supported.

返回值

Returns the number of bytes written or FALSE if an error occurred.

更新日志

版本	说明
5.1.0	Added the `options` parameter

范例

Example #1 Saving a DOM tree into a file

  <?php

$doc  = new  DOMDocument ( '1.0' );
 // we want a nice output
 $doc -> formatOutput  =  true ;

 $root  =  $doc -> createElement ( 'book' );
 $root  =  $doc -> appendChild ( $root );

 $title  =  $doc -> createElement ( 'title' );
 $title  =  $root -> appendChild ( $title );

 $text  =  $doc -> createTextNode ( 'This is the title' );
 $text  =  $title -> appendChild ( $text );

echo  'Wrote: '  .  $doc -> save ( "/tmp/test.xml" ) .  ' bytes' ;  // Wrote: 72 bytes

 ?>

参见

DOMDocument::saveXML() - Dumps the internal XML tree back into a string
DOMDocument::load() - Load XML from a file
DOMDocument::loadXML() - Load XML from a string

用户评论:

[#1] ludvig at ergopedia dot no [2014-10-31 10:21:56]

When creating a DOMDocument from scratch and saving it, the encoding will be utf-8, although it's declared as iso-8859-1.

When loading an XML-file declared and saved as iso-8859-1, php will keep the correct encoding when it's saved after changes are made.

Php converts files declared as iso-8859-1 to utf-8 internally. To add text containing special characters, the text must be encoded as utf-8. When the document is saved, special characters are converted to iso-8859-1.

To save an xml created from scratch, use fopen/fwrite and utf8_decode:

   $doc = new DOMDocument('1.0', 'iso-8859-1');

//Add som nodes and text with apropriate methods

   $f = fopen('xmlfile.xml', 'w+');
   fwrite($f, utf8_decode($doc->saveXML()));
   fclose($f);

[#2] john at johnreid dot it [2013-08-06 09:42:35]

I had been hitting my head against the wall when I couldn't get an edited XML file to save due to file permissions, even though I knew that it was OK.

Eventually I realised that for some odd reason, when I went to save the XML file, it would try to write the file to the root directory.

As such, use realpath() to keep the complete system path to the XML file when you load it:

<?php $myfile = 'myxml.xml'; $myfile = realpath($myfile); $doc = new DOMDocument('1.0'); $doc->load($myfile); // Let's just add a couple of elements for good measure $root = $doc->documentElement; $title = $doc->createElement('title'); $title = $root->appendChild($title); $text = $doc->createTextNode('This is a title'); $text = $title->appendChild($text); $doc->save($myfile); ?>

[#3] ss at littlerain dot com [2009-02-01 12:05:30]

In addition to:
DOMDocument->formatOutput = true
DOMDocument->preserveWhiteSpace = false

...you also have to ensure you don't add text nodes as siblings of element nodes, or formatOutput won't work.

[#4] chenel324 at gmail dot com [2008-10-19 06:38:12]

It took me forever to discover that
DOMDocument->formatOutput = true
will only have an effect on documents that are loaded from disk if one also sets
DOMDocument->preserveWhiteSpace = false ....

Hope this saves somebody a headache.

[#5] siegparr at NOSPAM dot web dot de [2006-07-07 08:00:53]

The XML parser converts the text of an XML document into UTF-8, even if you have set the character encoding of the XML, for example as a second parameter of the DOMDocument constructor. After parsing the XML with the load() command all its texts have been converted to UTF-8.

In case you append text nodes with special characters (e. g. Umlaut) to your XML document you should therefore use utf8_encode() with your text to convert it into UTF-8 before you append the text to the document. Otherwise you will get an error message like "output conversion failed due to conv error" at the save() command. See example below:

<?php // Text to insert into XML below $txt = "a text with special characters like '?', '?', '?' etc."; // Create Instance of DOMDocument $dom = new DOMDocument; // Load XML file // Was created before with DOMDocument('1.0', 'iso-8859-1') $dom = $dom->load("file.xml"); // Find the parent node $parent = $dom->documentElement; // Create Instance of DomXPath $xpath = new DomXPath($dom); // new node will be inserted before this node $next = $xpath->query("//parentnode/childnode"); // Create the new element $new_elem = $dom->createElement('new_elem'); // Insert the new element $parent->insertBefore($new_elem, $next->item(0)); // DOMXML = utf-8! (will be converted to iso-8859-1 only at 'save()') // prevents error message "output conversion failed due to conv error" at 'save()' $txt = utf8_encode($txt); // Create new text node with utf-8 encoded string $nodetext = $dom->createTextNode("$txt"); // Append text node to new element $nodetext = $new_elem->appendChild($nodetext); // save $dom->save("file.xml"); ?>

Hope this helps someone.

siegparr