Класс DOMNodeList

(PHP 5)

Обзор классов

DOMNodeList implements Traversable {
/* Свойства */
readonly public int $length ;
/* Методы */
DOMNode DOMNodelist::item ( int $index )
}

Свойства

length

Количество узлов, вошедших в список. Индексы в узлов списке лежат в промежутке от 0 до length - 1 включительно.

Смотрите также

Содержание

  • DOMNodelist::item — Извлекает узел с заданным индексом

Коментарии

In PHP 5.2.5 (Windows) it is not possible to iterate correctly over the DOMNodeList object returned by DOMNode->childNodes using foreach. Instead I had to use the for loop in conjunction with the item() method of DOMNodeList for iterating over all child nodes correctly.

I don't know whether this is really a bug, but apparently it is.
2008-04-21 05:35:26
http://php5.kiev.ua/manual/ru/class.domnodelist.html
In Response to 'kassah at gmail'

You don't need to convert a DOMNodeList to an array in order iterate through it using 'foreach'.  You can use foreach directly with the DOMNodeList.

$nodeList = $someDomDocument->getElementsbytagname('user');

foreach ($nodeList as $node) {
    echo $node->nodeValue;
}
2008-05-08 12:47:49
http://php5.kiev.ua/manual/ru/class.domnodelist.html
I have done some testing and have found 2 results:
(My System: Win XP with PHP 5.2.1)

1) Iteration with foreach does function correctly as "james dot j dot hackett at gmail dot com" writes, _if_ you only do readonly stuff with foreach or minor writings of some attributes.

2) foreach does not function, if you are doing some DOM-Operations while iterating. In my situation it was adding the iterated $node as an child to an new node:

$newNode = $dom->createElement('newNode') ;
foreach ($nodeList as $node) {
  echo $node->nodeValue ;
  $newNode->appendChild($node) ;
}

This only gives you the first element ...

I'm interpreting it as an confusing but correct behavior because of the changes within the $dom-object while appending the node at an additional place ... 

So, if you want to do something like 2) use for, length and item() :)
2008-05-14 07:56:18
http://php5.kiev.ua/manual/ru/class.domnodelist.html
Addition to my first note:

An traditional for-loop does not allow you to change the DOM-tree while looping - the effects are the nearly the same as with foreach. So you have to collect the nodes in an array and do the tree-altering stuff within a second loop (looping the array this time ...)
2008-05-14 09:11:58
http://php5.kiev.ua/manual/ru/class.domnodelist.html
You can modify, and even delete, nodes from a DOMNodeList if you iterate backwards:

$els = $document->getElementsByTagName('input');
for ($i = $els->length; --$i >= 0; ) {
  $el = $els->item($i);
  switch ($el->getAttribute('name')) {
    case 'MAX_FILE_SIZE' :
      $el->parentNode->removeChild($el);
    break;
    case 'inputfile' :
      $el->setAttribute('type', 'text');
    //break;
  }
}
2008-05-23 08:43:49
http://php5.kiev.ua/manual/ru/class.domnodelist.html
That's actually incorrect. You can use function results as objects. It makes building an API for your database very clean and neat. For example:

Our code:

$articles = Node::screate('tags', 123456)->assets('like:title:test')->articles;

We use the above code to get articles that are linked to assets that are linked to a specific tag in our database.
2008-08-26 12:12:01
http://php5.kiev.ua/manual/ru/class.domnodelist.html
Note that $length is calculated (php5.3.2).
Iterating over a large NodeList may be time expensive.

Prefer :
$nb = $nodelist->length;
for($pos=0; $pos<$nb; $pos++)

Than:
for($pos=0; $pos<$nodelist->length; $pos++)

I had a hard time figuring that out...
2010-05-19 11:39:58
http://php5.kiev.ua/manual/ru/class.domnodelist.html
If you want to recurse over a DOM then this might help: 
<?php 

/**
 * PHP's DOM classes are recursive but don't provide an implementation of 
 * RecursiveIterator. This class provides a RecursiveIterator for looping over DOMNodeList
 */
class DOMNodeRecursiveIterator extends ArrayIterator implements RecursiveIterator {
 
  public function 
__construct (DOMNodeList $node_list) {
   
   
$nodes = array();
    foreach(
$node_list as $node) {
     
$nodes[] = $node;
    }
   
   
parent::__construct($nodes);
   
  }
 
  public function 
getRecursiveIterator(){
    return new 
RecursiveIteratorIterator($thisRecursiveIteratorIterator::SELF_FIRST);
  }
 
  public function 
hasChildren () {
    return 
$this->current()->hasChildNodes();
  }

 
  public function 
getChildren () {
    return new 
self($this->current()->childNodes);
  }
 
}
?>
2012-07-04 13:39:50
http://php5.kiev.ua/manual/ru/class.domnodelist.html
It's worth to mention that DOMNodeList is not an Array,  so you have to convert first to an array before to use for, foreach or array_map, array_filter, array_walk functions.

Use iterator_to_array to make the conversion ( since PHP 5.1.0 ) .

<code>
  /* @ suppress warning var_dump not yet implemented for class */

@array_walk( iterator_to_array( $Some_NodeList ), 'var_dump' ) );

foreach( iterator_to_array( $Some_NodeList ) as $node )
    @var_dump( $node );

</code>

Hope is usefull.
2021-04-03 18:13:09
http://php5.kiev.ua/manual/ru/class.domnodelist.html

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