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    dom_import_simplexml

    (PHP 5, PHP 7, PHP 8)

    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

    dom_import_simplexml(object $node): DOMAttr|DOMElement

    この関数は、指定された node (SimpleXMLElement のインスタンス) を受けとり、 DOMAttr または DOMElement をそれぞれ作成します。 新しい DOMNode は、 既にある同じXMLノードを SimpleXMLElement として参照しています。

    パラメータ

    node

    インポートする属性または要素 (SimpleXMLElement のインスタンス)

    戻り値

    DOMAttr または DOMElement を返します。

    変更履歴

    バージョン 説明
    8.0.0 この関数は、失敗時に null を返さなくなりました。

    例

    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_sxe, true);
    $dom_sxe = $dom->appendChild($dom_sxe);

    echo     $dom->saveXML();

    ?>

    上の例の出力は以下となります。

    <?xml version="1.0"?>
<books><book><title>blah</title></book></books>

    例2 Import SimpleXML into DOM and modify SimpleXML through DOM

    Error handling omitted for brevity.

    <?php
    $sxe     = simplexml_load_string('<books><book><title>blah</title></book></books>');
    $elt = dom_import_simplexml($sxe);
    $elt->setAttribute("foo", "bar");
    echo     $sxe->asXML();
    ?>

    上の例の出力は以下となります。

    <?xml version="1.0"?>
<books foo="bar"><book><title>blah</title></book></books>

    参考

    • simplexml_import_dom() - XML または HTML ノードから SimpleXMLElement オブジェクトを取得する

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    User Contributed Notes 5 notes

    up
    13
    crescentfreshpot at yahoo dot com
    17 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
    3
    h4ss4n3 at hyj4z1 dot me
    4 years ago
    //No need to initiate, import and append on example#1

    (...)
    $dom_sxe = dom_import_simplexml($sxe);
    if (!$dom_sxe) {
    echo 'Erreur lors de la conversion du XML';
    exit;
    }

    //$dom = new DOMDocument('1.0');
    //$dom_sxe = $dom->importNode($dom_sxe, true);
    //$dom_sxe = $dom->appendChild($dom_sxe);

    //use ownerDocument propertie
    echo $dom->ownerDocument->saveXML();

    ?>
    up
    9
    Jeff M
    15 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
    0
    justinpatrin at php dot net
    18 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
    -1
    biniou at yopmail dot com
    8 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;
    }
    }
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