Php domdocument get node html

(PHP 5, PHP 7, PHP 8)

DOMDocument::getElementsByTagName — Searches for all elements with given local tag name

Description

public DOMDocument::getElementsByTagName(string $qualifiedName): DOMNodeList

Parameters

The local name (without namespace) of the tag to match on. The special value * matches all tags.

Return Values

A new DOMNodeList object containing all the matched elements.

Examples

Example #1 Basic Usage Example

$xml = <<< XML


 Patterns of Enterprise Application Architecture
 Design Patterns: Elements of Reusable Software Design
 Clean Code

XML;$dom = new DOMDocument;
$dom->loadXML($xml);
$books = $dom->getElementsByTagName('book');
foreach ($books as $book) {
    echo $book->nodeValue, PHP_EOL;
}
?>

The above example will output:

Patterns of Enterprise Application Architecture
Design Patterns: Elements of Reusable Software Design
Clean Code

See Also

• DOMDocument::getElementsByTagNameNS() - Searches for all elements with given tag name in specified namespace

James L ¶

14 years ago

Return if there are no matches is an empty DOMNodeList. Check using length property, e.g.:

$nodes=$domDocument->getElementsByTagName('book') ;
if ($nodes->length==0) {
   // no results
}
?>

Philip N ¶

12 years ago

Note that when using getElementsByTagName that it is a dynamic list. Thus if you have code which adjusts the DOM structure it will change the results of the getElementsByTagName results list.

The following code iterates through a complete set of results and changes them all to a new tag:

$nodes = $xml->getElementsByTagName ("oldtag");$nodeListLength = $nodes->length; // this value will also change
for ($i = 0; $i < $nodeListLength; $i ++)
{
    $node = $nodes->item(0);// some code to change the tag name from "oldtag" to something else
    // e.g. encrypting a tag element
}
?>

Since the list is dynamically updating, $nodes->item(0) is the next "unchanged" tag.

gurmukh24 at gmail dot com ¶

13 years ago

Following Example is of multiple attributes and multiple child nodes. this is being used to make joomla plugin for bulk upload of articles. Gurmukh Singh Bhatti

$xml =<<



          }

calvin at g mail ¶

11 years ago

My first post!
And this is how I get elements by attribute and its value.
For an example, if I want to grab all DIV tags with class name 'className', then...

$some_link = 'some website';
$tagName = 'div';
$attrName = 'class';
$attrValue = 'className';$dom = new DOMDocument;
$dom->preserveWhiteSpace = false;
@$dom->loadHTMLFile($some_link);$html = getTags( $dom, $tagName, $attrName, $attrValue );
echo $html;

function

gem at rellim dot com ¶

17 years ago

Here is an example of getElementsByTagName():

$xml =<<

 

foreach (

yaakov dot moddel at gmail dot com ¶

10 years ago

This is a very simplistic way to traverse xml nodes and childnodes using the DOMDocument class

$xml ='

   
        child 1
        child 2
        child 3
       
            Grandchild 1
            Grandchild 2
            Grandchild 3
       
   
   
        child 4
        child 5
        child 6
       
            Grandchild 4
            Grandchild 5
            Grandchild 6
       
   
';
      $doc = new DOMDocument();
      $doc->preserveWhiteSpace = false;
      $doc->loadXML($xml);
      $i=0;
            while(is_object($finance = $doc->getElementsByTagName("Parent")->item($i)))
            {
                     foreach($finance->childNodes as $nodename)
                     {
                             if($nodename->nodeName=='subParent')
                                {
                                     foreach($nodename->childNodes as $subNodes)
                                     {
                                     echo $subNodes->nodeName." - ".$subNodes->nodeValue."
";
                                     }
                                }
                             else
                                {
                                echo $nodename->nodeName." - ".$nodename->nodeValue."
";
                                }
                     }
      $i++;
            }
?>

simon at onepointltd dot com ¶

9 years ago

Here is a function to convert the populated tables in and HTML document into an array.

//Create an array containing all the populated tables in an HTML page
//Returned array: tables_to_array[table number][row number][column number]
function tables_to_array ($url) {
  $htmlDocDom = new DOMDocument();

  @

Finding values of a node ¶

15 years ago

I don't know if this is that obvious but it was not for me, so in addition to gem at rellim dot com's posting:
adding

echo $param -> nodeValue.'
';
?>

to the loop will output
value1
value2
value3

rsvvuuren at hotmail dot com ¶

8 years ago

I was in need of $dom->getElementsByTagName that would hist magic within a contextNode.

Why i needed getElementsByTagName instead of just simple using an xPath->query is because while looping through the returned nodelist, more nodes with the tagName i was looking for where created.

When using getElementsByTagName, the new nodes are "added" to the nodelist i already am looping through.

When using an xpath query, you wil only loop through the original nodelist, the newly created elements wil not appear in that nodelist.

I was already using an extended class on domDocument, so it was simple to create an kind of getElementsByTagName that would accept an contextNode.

class SmartDocument extends DOMDocument {
    private $localDom;
    public $xpath;
    private $serialize = array('localDom');

        private

metron at underhive-planet dot com ¶

11 years ago

My first try to get a stable solution with this function, failed with this Exception:

"Fatal error: Call to undefined method DOMNodeList::getElementsByTagName()"
This is the xml snipplet:



 
    ....
 



So the php code to climb along the elements is:


$src

Mateusz K ¶

2 years ago

If you want to move all nodes to another tag you can do it like that
Eg: replace