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(PHP 5, PHP 7)
DOMNodelist::item — Retrieves a node specified by index
$index
)
Retrieves a node specified by index
within the
DOMNodeList object.
If you need to know the number of nodes in the collection, use the length property of the DOMNodeList object.
index
Index of the node into the collection.
The node at the index
th position in the
DOMNodeList, or NULL
if that is not a valid
index.
Example #1 Traversing all the entries of the table
<?php
$doc = new DOMDocument ;
$doc -> load ( 'book.xml' );
$items = $doc -> getElementsByTagName ( 'entry' );
for ( $i = 0 ; $i < $items -> length ; $i ++) {
echo $items -> item ( $i )-> nodeValue . "\n" ;
}
?>
Alternatively, you can use foreach, which is a much more convenient way:
<?php
foreach ( $items as $item ) {
echo $item -> nodeValue . "\n" ;
}
?>
以上例程会输出:
Title Author Language ISBN The Grapes of Wrath John Steinbeck en 0140186409 The Pearl John Steinbeck en 014017737X Samarcande Amine Maalouf fr 2253051209
[#1] strangerli at onlinehome dot de [2013-09-13 08:11:35]
Actually "item" returns DOMElement and not DOMNode. DOMElement extends only DOMNode.
http://3v4l.org/KAj7c
[#2] Anonymous [2012-06-25 23:36:25]
calling domnodelist->item($i) with an index $i greater than domnodelist->length - 1 , will return the entire document, will not produce an error, and will not circle back to the start of the list.
[#3] Nagy Attila [2011-01-06 09:02:34]
DOMNodeList::item does not return in constant time!
If you need to iterate over large nodelist then you'd better use standard navigation.
Instead of:
<?php
foreach ($nodelist as $node) {
// do something
}
?>
you could do:
<?php
$node = $parentnode->firstChild;
do {
// do something
} while ($node = $node->nextSibling);
?>
[#4] olivier dot berger at it-sudparis dot eu [2008-08-21 02:56:14]
It seems that with zend.ze1_compatibility_mode on, the only way to iterate over the items list is with :
for ($i = 0; $i < $nodeList->length; ++$i) {
$nodeName = $nodeList->item($i)->nodeName;
$nodeValue = $nodeList->item($i)->nodeValue;
}
As other attemps failed :
for ($i = 0; $i < $nodeList->length; ++$i) {
$node = &$nodeList->item($i);
$nodeName = $node->nodeName;
$nodeValue = $node->nodeValue;
}
or :
foreach ($nodeList as $node) {
echo $node->nodeName;
echo $node->nodeValue;
}
[#5] vinyanov at poczta dot onet dot pl [2008-01-05 22:12:45]
SimpleXML has its own SPL iterator. See http://www.php.net/~helly/php/ext/spl/classSimpleXMLIterator.html . But I guess that there are none for DOM nodes. By the way, two out of three implementations I found over the Net were not recursive, so I wrote my own. Here is the snippet:
<?php
class DOMNodeListIterator implements RecursiveIterator
{
private
$nodes,
$offset;
function __construct(DOMNodeList $nodes)
{
return $this -> nodes = $nodes;
}
function rewind()
{
return $this -> offset = 0;
}
function current()
{
return $this -> nodes -> item($this -> offset);
}
function key()
{
return $this -> current() -> nodeName;
}
function next()
{
return $this -> offset++;
}
function valid()
{
return $this -> offset < $this -> nodes -> length;
}
function hasChildren()
{
return isset($this -> current() -> childNodes -> length) && $this -> current() -> childNodes -> length > 0;
}
function getChildren()
{
return new self($this -> current() -> childNodes);
}
}
?>
Remember to use RecursiveIteratorIterator::SELF_FIRST flag when you create your iterator iterator.
<?php
$iterator = new DOMNodeListIterator($document -> childNodes);
$iterator = new RecursiveIteratorIterator($iterator, RecursiveIteratorIterator::SELF_FIRST);
?>
Should work, has just few minutes though. :)
[#6] Hayley Watson [2007-10-29 14:14:59]
Keep in mind that DOMNodelists are "live" - changes to the document or node that the DOMNodelist was derived from will be reflected in the DOMNodelist. In other words, a list of a parent node's children will change if you change the parent's children!
[#7] james dot dunmore at gmai dot com [2007-07-27 08:57:43]
tfg_allardyce at gmail dot com
I have had exactly this problem.
To rectify I've had to do this:
<?php
$old_element = $doc->getElementsByTagName('Element1')->item(0);
$new_element = $doc->createElement('NewElement1');
$old_element_childNodes = $old_element->childNodes;
$length = $old_element_childNodes->length;
for($i = 0; $i < $length; $i++)
{
$oldChildren_array[] = $old_element_childNodes->item($i);
}
foreach($oldChildren_array as $old_c)
{
$new_element->appendChild($old_c);
}
?>
Rather than this:
(which I will bug report)
<?php
$old_element = $doc->getElementsByTagName('Element1')->item(0):
$new_element = $doc->createElement('NewElement1');
foreach($old_element->childNode as $node)
{
$new_element->appendChild($node);
}
?>
Using the latter, randomally removes the children!
[#8] Geoffrey Thubron [2007-05-26 14:47:09]
@ tfg_allardyce at gmail dot com
You could loop through the list backwards, that way, you are only ever taking off the last item from the list, and hence wont have disrupted the order.
[#9] oliver dot christen at camptocamp dot com [2007-02-13 07:27:15]
NodeList are something annoying because you can't output the content with a simple print_r, so I did a little function that add all the node to a new empty DOMDocument and output it as a string.
Have fun.
<?php
public function domNodeList_to_string($DomNodeList) {
$output = '';
$doc = new DOMDocument;
while ( $node = $DomNodeList->item($i) ) {
// import node
$domNode = $doc->importNode($node, true);
// append node
$doc->appendChild($domNode);
$i++;
}
$output = $doc->saveXML();
$output = print_r($output, 1);
// I added this because xml output and ajax do not like each others
$output = htmlspecialchars($output);
return $output;
}
?>