PHP 7.1.24 Released

dom_import_simplexml

(PHP 5, PHP 7)

dom_import_simplexml SimpleXMLElement オブジェクトから DOMElement オブジェクトを取得する

説明

DOMElement dom_import_simplexml ( SimpleXMLElement $node )

この関数は、SimpleXML クラスの ノード node を受け取り、それを DOMElement ノードに変換します。新しいオブジェクトは、 DOMElement ノードとして使用可能です。

パラメータ

node

SimpleXMLElement ノード。

返り値

追加された DOMElement ノード、あるいは 何らかのエラーが発生した場合は FALSE を返します。

例1 dom_import_simplexml() を用いて SimpleXML を DOM にインポートする

<?php

$sxe 
simplexml_load_string('<books><book><title>blah</title></book></books>');

if (
$sxe === false) {
    echo 
'ドキュメントのパース中にエラー';
    exit;
}

$dom_sxe dom_import_simplexml($sxe);
if (!
$dom_sxe) {
    echo 
'XML の変換中にエラー';
    exit;
}

$dom = new DOMDocument('1.0');
$dom_sxe $dom->importNode($dom_sxetrue);
$dom_sxe $dom->appendChild($dom_sxe);

echo 
$dom->saveXML();

?>

参考

add a note add a note

User Contributed Notes 4 notes

up
6
Jeff M
9 years ago
SimpleXML is an 'Object Mapping XML API'. It is not DOM, per se. SimpleXML converts the XML elements into PHP's native data types.

The dom_import_simplexml and simplexml_import_dom functions do *not* create separate copies of the original object. You are free to use the methods of either or both interchangeably, since the underlying instance is the same.

<?php
   
// initialize a simplexml object
   
$sxe = simplexml_load_string('<root/>');
   
   
// get a dom interface on the simplexml object
   
$dom = dom_import_simplexml($sxe);

   
// dom adds a new element under the root
   
$element = $dom->appendChild(new DOMElement('dom_element'));
   
   
// dom adds an attribute on the new element
   
$element->setAttribute('creator', 'dom');

   
// simplexml adds an attribute on the dom element
   
$sxe->dom_element['sxe_attribute'] = 'added by simplexml';

   
// simplexml adds a new element under the root
   
$element = $sxe->addChild('sxe_element');
   
   
// simplexml adds an attribute on the new element
   
$element['creator'] = 'simplexml';

   
// dom finds the simplexml element (via DOMNodeList->index)
   
$element = $dom->getElementsByTagName('sxe_element')->item(0);

   
// dom adds an attribute on the simplexml element
   
$element->setAttribute('dom_attribute', 'added by dom');
   
    echo (
'<pre>');           
   
print_r($sxe);
    echo (
'</pre>');
?>

Outputs:

SimpleXMLElement Object
(
    [dom_element] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [creator] => dom
                    [sxe_attribute] => added by simplexml
                )

        )

    [sxe_element] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [creator] => simplexml
                    [dom_attribute] => added by dom
                )

        )

)

What this illustrates is that both interfaces are operating on the same underlying object instance. Also, when you dom_import_simplexml, you can create and add new elements without reference to an ownerDocument (or documentElement).

So passing a SimpleXMLElement to another method does not mean the recipient is limited to using SimpleXML methods.

Hey Presto! Your telescope has become a pair of binoculars!
up
6
crescentfreshpot at yahoo dot com
10 years ago
justinpatrin at php dot net:
> To get a proper DOM document (which you need to do most things) you need...

No you don't. Just do:
<?php
$dom
= dom_import_simplexml($xml)->ownerDocument;
?>
up
1
justinpatrin at php dot net
12 years ago
I've found that newer versions of PHP5 require some special syntax in order to properly convert between SimpleXML and DOM. It's not as easy as calling dom_import_simplexml() with a SimpleXML node. To get a proper DOM document (which you need to do most things) you need:
<?php
//$xml is a SimpleXML instance
$domnode = dom_import_simplexml($xml);
$dom = new DOMDocument();
$domnode = $dom->importNode($domnode, true);
$dom->appendChild($domnode);
?>

Switching back, though, is, well...simple.

<?php
//$dom is a DOMDocument instance
$xml = simplexml_import_dom($dom);
?>
up
-3
biniou at yopmail dot com
2 years ago
Very useful to add a CDATA node with SimpleXMLElement (use it like addChild) :

<?php
class My_SimpleXMLElement extends SimpleXMLElement {
   
    public function
addChildWithCData($name, $value = NULL) {
       
$new_child = $this->addChild($name);
       
       
$node = dom_import_simplexml($new_child);
       
$no = $node->ownerDocument;
       
$node->appendChild($no->createCDATASection($value));
   
        return
$new_child;
    }
}
To Top