The DOMNamedNodeMap class

(PHP 5, PHP 7, PHP 8)

类摘要

DOMNamedNodeMap implements Traversable , Countable {

/* 属性 */

public readonly int $length ;

/* 方法 */

public count ( ) : int|false

public getNamedItem ( string $qualifiedName ) : DOMNode|null

public getNamedItemNS ( string|null $namespace , string $localName ) : DOMNode|null

public item ( int $index ) : DOMNode|null

}

属性

length: The number of nodes in the map. The range of valid child node indices is 0 to length - 1 inclusive.

DOMNamedNodeMap::count — Get number of nodes in the map
DOMNamedNodeMap::getNamedItem — Retrieves a node specified by name
DOMNamedNodeMap::getNamedItemNS — Retrieves a node specified by local name and namespace URI
DOMNamedNodeMap::item — Retrieves a node specified by index

User Contributed Notes

sirajshaikh96 at yahoo dot com 01-Jan-2021 02:48


I have tried to solve the general problem occurs in DOMNamedNodeMap that during executing for/foreachloop after executing removeAttribute('$name') for item(0), item(1) is not executing and warning occurs. Following codes give the solution of this problem that in loop item(0) should be applied rather than item($i) because after removing first attribute node now present element has only one attribute node.



<?php

$html  = '<h1 id="h1test" class="h2test">Heading</h1>';

$html .= '<p align="left" class="right">Hello World</p>';



$doc = new DOMDocument();

$doc->loadHTML($html);



// remove attributes from  the h1 element

$h1 = $doc->getElementsByTagName('h1')->item(0);

$length = $h1->attributes->length;

for ($i = 0; $i < $length; $i++) {    

    $name = $h1->attributes->item(0)->nodeName;

    $value = $h1->attributes->item(0)->nodeValue;

    $h1->removeAttribute($name);    

    echo "h1: removed attribute name :- " .$name."</br>";

    echo "h1: removed attribute value :- " .$value."</br>";   

    } 

// remove attributes from the p element

$p = $doc->getElementsByTagName('p')->item(0);

for ($i = 0; $i < $length; $i++) {        

    $name = $p->attributes->item(0)->nodeName;

    $value = $p->attributes->item(0)->nodeValue;

    $p->removeAttribute($name);    

    echo "p: removed attribute name :- " .$name."</br>";

    echo "p: removed attribute value :- " .$value."</br>";   

}

?>



OUTPUT:



h1: removed attribute name :- id

h1: removed attribute value :- h1test

h1: removed attribute name :- class

h1: removed attribute value :- h2test

p: removed attribute name :- align

p: removed attribute value :- left

p: removed attribute name :- class

p: removed attribute value :- right

kendsnyder at gmail dot com 29-Oct-2009 07:55


To add to xafford's comment. When iterating a named node map collection using ->item() or using foreach, removing a attribute with DOMNode->removeAttribute() or DOMNode->removeAttributeNode() alters the collection as if it were a stack. To illustrate, the code below tries to remove all attributes from each element but only removes the first. One work around is to copy the named node map into an array before removing attributes. Using PHP 5.2.9 on Windows XP.



<?php

error_reporting(E_ALL);

$html  = '<h1 id="h1test" class="h1test">Heading</h1>';

$html .= '<p align="left" class="ptest">Hello World</p>';



$doc = new DOMDocument();

$doc->loadHTML($html);



// remove attributes from  the h1 element

$h1 = $doc->getElementsByTagName('h1')->item(0);

$length = $h1->attributes->length;

for ($i = 0; $i < $length; ++$i) {

    $name = $h1->attributes->item($i)->name;

    $h1->removeAttribute($name);

    echo "h1: removed attribute `$name`<br>";

}

// remove attributes from the p element

$p = $doc->getElementsByTagName('p')->item(0);

foreach ($p->attributes as $name => $attrNode) {

    $p->removeAttribute($name);

    echo "p: removed attribute `$name`<br>";

}



?>



OUTPUT:

-------

h1: removed attribute `id`



Notice: Trying to get property of non-object in nodemap.php on line 13

h1: removed attribute ``

p: removed attribute `align`

xafford 15-Oct-2009 03:16


I stumbled upon a problem with DOMNamedNodeMap. If you iterate over a DOMNamedNodeMap, representing the attributes of a DOMElement with foreach and you use DOMElement::removeAttributeNode only the first attribute will be handled.





Example (not complete):





<?php





/*


 * Imagine you got a node like this:


 * <a onclick="alert('evil')" href="http://example.com">evil</a>


 * and onclick should be removed, href would not be tested.


 */





foreach ( $node->attributes as $attribute )


{





    echo 'checking attribute ', $attribute->name, '<br />';





    if ( ! in_array ( $attribute->name, $allowed_attributes ) )


    {


        $node->removeAttributeNode ( $attribute );


    }





}





?>





The output would be:





checking attribute onclick

The DOMNamedNodeMap class

类摘要

属性

Table of Contents

User Contributed Notes