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(PHP 5)
DOMDocument::save — Dumps the internal XML tree back into a file
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.
The path to the saved XML document.
Additional Options. Currently only LIBXML_NOEMPTYTAG is supported.
Returns the number of bytes written or FALSE if an error occurred.
| Version | Beschreibung |
|---|---|
| 5.1.0 | Added the options parameter |
Beispiel #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
?>
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.
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.
If you're working with an existing XML file that contains an entity definition with an external reference like this one:
[
<!ENTITY % all.entities SYSTEM "all-entities.ent">
%all.entities;
]>
Be warned that DOMDocument->save() will expand this to include all definitions in all referenced entities file(s) when it writes the file. In other words, the same section of your saved file would now look something like this:
<!ENTITY % all.entities SYSTEM "all-entities.ent">
<!--
This file names all the entity files needed by .xml files in the
current directory. All ENTITY declarations should be given
first, followed by references to the those entities.
--><!ENTITY % fixedchars.entities SYSTEM "../common/fixedchars.ent">
<!ENTITY % urls.entities SYSTEM "../refman-common/urls.ent">
<!ENTITY % phrases.entities SYSTEM "../common/phrases.ent">
<!ENTITY % ndb.entities SYSTEM "ndb.en.ent">
<!ENTITY minus "–"><!-- 2013 is actually Unicode for ndash -->
<!ENTITY Oslash "Ø">
<!ENTITY macr "¯">
<!ENTITY auml "ä">
[etc.]
I've not found a way to keep this from occurring.
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 'ä', 'ß', 'Ü' 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
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