CascadiaPHP 2024

A classe DOMNode

(PHP 5, PHP 7, PHP 8)

Resumo da classe

class DOMNode {
/* Propriedades */
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;
/* Métodos */
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
}

Propriedades

nodeName

Retorna o nome mais preciso para o tipo atual de nó

nodeValue

O valor deste nó, dependendo do seu tipo. Contrariamente à especificação do W3C, o valor do nó de DOMElement é igual a DOMNode::textContent em vez de null.

nodeType

Obtém o tipo do nó. Um dos constantes predefinidas XML_xxx_NODE

parentNode

O pai deste nó. Se não houver tal nó, isso retorna null.

parentElement

O elemento pai deste elemento. Se não houver tal elemento, isso retorna null.

childNodes

Um DOMNodeList que contém todos os filhos deste nó. Se não houver filhos, isso é um DOMNodeList vazio.

firstChild

O primeiro filho deste nó. Se não houver tal nó, isso retorna null.

lastChild

O último filho deste nó. Se não houver tal nó, isso retorna null.

previousSibling

O nó imediatamente anterior a este nó. Se não houver tal nó, isso retorna null.

nextSibling

O nó imediatamente seguinte a este nó. Se não houver tal nó, isso retorna null.

attributes

Um DOMNamedNodeMap que contém os atributos deste nó (se for um DOMElement) ou null caso contrário.

isConnected

Se o nó está conectado a um documento.

ownerDocument

O objeto DOMDocument associado a este nó, ou null se este nó for um DOMDocument

namespaceURI

O URI do namespace deste nó, ou null se não estiver especificado.

prefix

O prefixo do namespace deste nó.

localName

Retorna a parte local do nome qualificado deste nó.

baseURI

O URI base absoluto deste nó, ou null se a implementação não conseguir obter um URI absoluto.

textContent

O conteúdo textual deste nó e de seus descendentes.

Registro de Alterações

Versão Descrição
8.3.0 As propriedades DOMNode::$parentElement, e DOMNode::$isConnected foram adicionadas.
8.0.0 Os métodos não implementados DOMNode::compareDocumentPosition(), DOMNode::isEqualNode(), DOMNode::getFeature(), DOMNode::setUserData() e DOMNode::getUserData() foram removidos.

Notas

Nota:

A extensão DOM usa codificação UTF-8. Use mb_convert_encoding(), UConverter::transcode() ou iconv() para lidar com outras codificações.

Índice

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_")
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