Класс DOMNode

(PHP 5, PHP 7, PHP 8)

Обзор класса

class DOMNode {
/* Свойства */
public readonly string $nodeName;
public readonly int $nodeType;
public readonly ?DOMNode $parentNode;
public readonly ?DOMElement $parentElement;
public readonly DOMNodeList $childNodes;
public readonly ?DOMNode $firstChild;
public readonly ?DOMNode $lastChild;
public readonly ?DOMNode $previousSibling;
public readonly ?DOMNode $nextSibling;
public readonly ?DOMNamedNodeMap $attributes;
public readonly bool $isConnected;
public readonly ?DOMDocument $ownerDocument;
public readonly ?string $namespaceURI;
public string $prefix;
public readonly ?string $localName;
public readonly ?string $baseURI;
/* Методы */
public C14N(
    bool $exclusive = false,
    bool $withComments = false,
    ?array $xpath = null,
    ?array $nsPrefixes = null
): string|false
public C14NFile(
    string $uri,
    bool $exclusive = false,
    bool $withComments = false,
    ?array $xpath = null,
    ?array $nsPrefixes = null
): int|false
public cloneNode(bool $deep = false): DOMNode|false
public getLineNo(): int
public getRootNode(?array $options = null): DOMNode
public insertBefore(DOMNode $node, ?DOMNode $child = null): DOMNode|false
public isDefaultNamespace(string $namespace): bool
public isEqualNode(?DOMNode $otherNode): bool
public isSameNode(DOMNode $otherNode): bool
public isSupported(string $feature, string $version): bool
public lookupPrefix(string $namespace): ?string
public normalize(): void
public replaceChild(DOMNode $node, DOMNode $child): DOMNode|false
}

Свойства

nodeName

Возвращает наиболее точное имя для текущего типа узла

nodeValue

Значение этого узла, в зависимости от его типа. Значения узлов DOMElement, в отличие от спецификации W3C, равны DOMNode::textContent, а не null.

nodeType

Возвращает тип узла. Одна из возможных констант XML_xxx_NODE

parentNode

Родительский узел узла. Если такого узла нет, возвращает null

parentElement

Родительский элемент текущего элемента. Если такого элемента нет, будет возвращено значение null.

childNodes

Объект DOMNodeList, содержащий всех потомков узла. Если потомков нет, возвращается пустой объект DOMNodeList.

firstChild

Первый дочерний узел узла. Если такого узла нет, возвращает null.

lastChild

Последний дочерний узел текущего узла. Если такого узла нет, возвращает null.

previousSibling

Узел, непосредственно предшествующий текущему узлу. Если такого узла нет, возвращает null.

nextSibling

Узел, непосредственно следующий за узлом. Если такого узла нет, возвращает null.

attributes

Объект DOMNamedNodeMap, содержащий атрибуты узла (только если это DOMElement), иначе вернёт null.

isConnected

Указывает, присоединен ли узел к документу

ownerDocument

Объект DOMDocument, связанный с узлом, либо null, если узел — объект класса DOMDocument.

namespaceURI

URI пространство имён узла или null, если он не указан.

prefix

Префикс пространства имён узла.

localName

Возвращает локальную часть квалифицированного имя узла.

baseURI

Абсолютный базовый URI узла или null, если реализация не смогла получить абсолютный URI.

textContent

Текстовое содержимое узла и его потомков

Список изменений

Версия Описание
8.3.0 Были добавлены свойства DOMNode::$parentElement и DOMNode::$isConnected.
8.0.0 Нереализованные методы DOMNode::compareDocumentPosition(), DOMNode::isEqualNode(), DOMNode::getFeature(), DOMNode::setUserData() и DOMNode::getUserData() были удалены.

Примечания

Замечание:

Модуль DOM работает с кодировкой UTF-8. Для работы с другими кодировками пользуются функциями mb_convert_encoding(), UConverter::transcode() или iconv().

Содержание

add a note

User Contributed Notes 14 notes

up
40
marc at ermshaus dot org
15 years ago
It took me forever to find a mapping for the XML_*_NODE constants. So I thought, it'd be handy to paste it here:

1 XML_ELEMENT_NODE
2 XML_ATTRIBUTE_NODE
3 XML_TEXT_NODE
4 XML_CDATA_SECTION_NODE
5 XML_ENTITY_REFERENCE_NODE
6 XML_ENTITY_NODE
7 XML_PROCESSING_INSTRUCTION_NODE
8 XML_COMMENT_NODE
9 XML_DOCUMENT_NODE
10 XML_DOCUMENT_TYPE_NODE
11 XML_DOCUMENT_FRAGMENT_NODE
12 XML_NOTATION_NODE
up
23
David Rekowski
14 years ago
You cannot simply overwrite $textContent, to replace the text content of a DOMNode, as the missing readonly flag suggests. Instead you have to do something like this:

<?php

$node
->removeChild($node->firstChild);
$node->appendChild(new DOMText('new text content'));

?>

This example shows what happens:

<?php

$doc
= DOMDocument::loadXML('<node>old content</node>');
$node = $doc->getElementsByTagName('node')->item(0);
echo
"Content 1: ".$node->textContent."\n";

$node->textContent = 'new content';
echo
"Content 2: ".$node->textContent."\n";

$newText = new DOMText('new content');

$node->appendChild($newText);
echo
"Content 3: ".$node->textContent."\n";

$node->removeChild($node->firstChild);
$node->appendChild($newText);
echo
"Content 4: ".$node->textContent."\n";

?>

The output is:

Content 1: old content // starting content
Content 2: old content // trying to replace overwriting $node->textContent
Content 3: old contentnew content // simply appending the new text node
Content 4: new content // removing firstchild before appending the new text node

If you want to have a CDATA section, use this:

<?php
$doc
= DOMDocument::loadXML('<node>old content</node>');
$node = $doc->getElementsByTagName('node')->item(0);
$node->removeChild($node->firstChild);
$newText = $doc->createCDATASection('new cdata content');
$node->appendChild($newText);
echo
"Content withCDATA: ".$doc->saveXML($node)."\n";
?>
up
19
R. Studer
14 years ago
For clarification:
The assumingly 'discoverd' by previous posters and seemingly undocumented methods (.getElementsByTagName and .getAttribute) on this class (DOMNode) are in fact methods of the class DOMElement, which inherits from DOMNode.

See: http://www.php.net/manual/en/class.domelement.php
up
6
Steve K
14 years ago
This class apparently also has a getElementsByTagName method.

I was able to confirm this by evaluating the output from DOMNodeList->item() against various tests with the is_a() function.
up
9
brian wildwoodassociates.info
15 years ago
This class has a getAttribute method.

Assume that a DOMNode object $ref contained an anchor taken out of a DOMNode List. Then

$url = $ref->getAttribute('href');

would isolate the url associated with the href part of the anchor.
up
5
alastair dot dallas at gmail dot com
12 years ago
The issues around mixed content took me some experimentation to remember, so I thought I'd add this note to save others time.

When your markup is something like: <div><p>First text.</p><ul><li><p>First bullet</p></li></ul></div>, you'll get XML_ELEMENT_NODEs that are quite regular. The <div> has children <p> and <ul> and the nodeValue for both <p>s yields the text you expect.

But when your markup is more like <p>This is <b>bold</b> and this is <i>italic</i>.</p>, you realize that the nodeValue for XML_ELEMENT_NODEs is not reliable. In this case, you need to look at the <p>'s child nodes. For this example, the <p> has children: #text, <b>, #text, <i>, #text.

In this example, the nodeValue of <b> and <i> is the same as their #text children. But you could have markup like: <p>This <b>is bold and <i>bold italic</i></b>, you see?</p>. In this case, you need to look at the children of <b>, which will be #text, <i>, because the nodeValue of <b> will not be sufficient.

XML_TEXT_NODEs have no children and are always named '#text'. Depending on how whitespace is handled, your tree may have "empty" #text nodes as children of <body> and elsewhere.

Attributes are nodes, but I had forgotten that they are not in the tree expressed by childNodes. Walking the full tree using childNodes will not visit any attribute nodes.
up
7
imranomar at gmail dot com
13 years ago
Just discovered that node->nodeValue strips out all the tags
up
2
metanull
9 years ago
Yet another DOMNode to php array conversion function.
Other ones on this page are generating too "complex" arrays; this one should keep the array as tidy as possible.
Note: make sure to set LIBXML_NOBLANKS when calling DOMDocument::load, loadXML or loadHTML
See: http://be2.php.net/manual/en/libxml.constants.php
See: http://be2.php.net/manual/en/domdocument.loadxml.php

<?php
/**
* Returns an array representation of a DOMNode
* Note, make sure to use the LIBXML_NOBLANKS flag when loading XML into the DOMDocument
* @param DOMDocument $dom
* @param DOMNode $node
* @return array
*/
function nodeToArray( $dom, $node) {
if(!
is_a( $dom, 'DOMDocument' ) || !is_a( $node, 'DOMNode' )) {
return
false;
}
$array = false;
if( empty(
trim( $node->localName ))) {// Discard empty nodes
return false;
}
if(
XML_TEXT_NODE == $node->nodeType ) {
return
$node->nodeValue;
}
foreach (
$node->attributes as $attr) {
$array['@'.$attr->localName] = $attr->nodeValue;
}
foreach (
$node->childNodes as $childNode) {
if (
1 == $childNode->childNodes->length && XML_TEXT_NODE == $childNode->firstChild->nodeType ) {
$array[$childNode->localName] = $childNode->nodeValue;
} else {
if(
false !== ($a = self::nodeToArray( $dom, $childNode))) {
$array[$childNode->localName] = $a;
}
}
}
return
$array;
}
?>
up
2
pizarropablo at gmail dot com
10 years ago
In response to: alastair dot dallas at gmail dot com about "#text" nodes.
"#text" nodes appear when there are spaces or new lines between end tag and next initial tag.

Eg "<data><age>10</age>[SPACES]<other>20</other>[SPACES]</data>"

"data" childNodes has 4 childs:
- age = 10
- #text = spaces
- other = 20
- #text = spaces
up
4
matt at lamplightdb dot co dot uk
15 years ago
And apparently also a setAttribute method too:

$node->setAttribute( 'attrName' , 'value' );
up
1
matej dot golian at gmail dot com
10 years ago
Here is a little function that truncates a DomNode to a specified number of text characters. I use it to generate HTML excerpts for my blog entries.

<?php

function makehtmlexcerpt(DomNode $html, $excerptlength)
{
$remove = 0;
$htmllength = strlen(html_entity_decode($html->textContent, ENT_QUOTES, 'UTF-8'));
$truncate = $htmllength - $excerptlength;
if(
$htmllength > $excerptlength)
{
if(
$html->hasChildNodes())
{
$children = $html->childNodes;
for(
$counter = 0; $counter < $children->length; $counter ++)
{
$child = $children->item($children->length - ($counter + 1));
$childlength = strlen(html_entity_decode($child->textContent, ENT_QUOTES, 'UTF-8'));
if(
$childlength <= $truncate)
{
$remove ++;
$truncate = $truncate - $childlength;
}
else
{
$child = makehtmlexcerpt($child, $childlength - $truncate);
break;
}
}
if(
$remove != 0)
{
for(
$counter = 0; $counter < $remove; $counter ++)
{
$html->removeChild($html->lastChild);
}
}
}
else
{
if(
$html->nodeName == '#text')
{
$html->nodeValue = substr(html_entity_decode($html->nodeValue, ENT_QUOTES, 'UTF-8'), 0, $htmllength - $truncate);
}
}
}
return
$html;
}

?>
up
-1
Anonymous
6 years ago
It would be helpful if docs for concrete properties mentioned readonly status of some properties:
"
ownerDocument

The DOMDocument object associated with this node.

"
up
-1
zlk1214 at gmail dot com
8 years ago
A function that can set the inner HTML without encoding error. $html can be broken content such as "<a ID=id20>ssss"
function setInnerHTML($node, $html) {
removeChildren($node);
if (empty($html)) {
return;
}

$doc = $node->ownerDocument;
$htmlclip = new DOMDocument();
$htmlclip->loadHTML('<meta http-equiv="Content-Type" content="text/html;charset=utf-8"><div>' . $html . '</div>');
$clipNode = $doc->importNode($htmlclip->documentElement->lastChild->firstChild, true);
while ($item = $clipNode->firstChild) {
$node->appendChild($item);
}
}
up
-9
I. Cook
14 years ago
For a reference with more information about the XML DOM node types, see http://www.w3schools.com/dom/dom_nodetype.asp

(When using PHP DOMNode, these constants need to be prefaced with "XML_")
To Top