Web студия "GrandView"

Примеры

Пример 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"; } ?>
Результат выполнения данного примера:
Title Author Language ISBN The Grapes of Wrath John Steinbeck en 0140186409 The Pearl John Steinbeck en 014017737X Samarcande Amine Maalouf fr 2253051209

add a note User Contributed Notes
DOMNodelist->item()

Hayley Watson
29-Oct-2007 03:14


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!

james dot dunmore at gmai dot com
27-Jul-2007 08:57


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!

Geoffrey Thubron
26-May-2007 02:47


@ 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.

oliver dot christen at camptocamp dot com
13-Feb-2007 07:27


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;

}



?>

tfg_allardyce at gmail dot com
10-Jan-2007 03:57


Be careful when looping through a DOMNodeList and moving its nodes around, sometimes this will take that node off the DOMNodeList and sometimes it wont!



<?php

// let $nodes be node list and $parent be some other node



foreach($nodes as $node) {

   $parent->appendChild($node);

}



?>



In some cases the $node will be taken off the list and the next iteration of the loop will be corrupted, skipping every other node in the list! In other cases the node will remain in the list and everything will be fine.



Generally if you've created the node list using a getElementsByTagName call or an XPath query then the nodes will stay on the list. If the node list comes from another nodes' childNodes property those child nodes will be shifted off the list whenever you call appendChild.

add a note

DOMNodelist->item()

Описание

Список параметров

Возвращаемые значения

Примеры