DOMDocument::save

(PHP 5)

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

说明

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

PHP手册 - N: Dumps the internal XML tree back into a file

用户评论:

ss at littlerain dot com (01-Feb-2009 08:05)

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.

chenel324 at gmail dot com (19-Oct-2008 02:38)

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.

jon at mysql dot com (02-Nov-2007 10:38)

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"> <!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 "–"> <!ENTITY Oslash "Ø"> <!ENTITY macr "¯"> <!ENTITY auml "ä"> [etc.] I've not found a way to keep this from occurring.

siegparr at NOSPAM dot web dot de (07-Jul-2006 04:00)

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