php – How to get innerHTML of DOMNode?-ThrowExceptions

Exception or error:

What function do you use to get innerHTML of a given DOMNode in the PHP DOM implementation? Can someone give reliable solution?

Of course outerHTML will do too.

How to solve:

Compare this updated variant with PHP Manual User Note #89718:

<?php 
function DOMinnerHTML(DOMNode $element) 
{ 
    $innerHTML = ""; 
    $children  = $element->childNodes;

    foreach ($children as $child) 
    { 
        $innerHTML .= $element->ownerDocument->saveHTML($child);
    }

    return $innerHTML; 
} 
?> 

Example:

<?php 
$dom= new DOMDocument(); 
$dom->preserveWhiteSpace = false;
$dom->formatOutput       = true;
$dom->load($html_string); 

$domTables = $dom->getElementsByTagName("table"); 

// Iterate over DOMNodeList (Implements Traversable)
foreach ($domTables as $table) 
{ 
    echo DOMinnerHTML($table); 
} 
?> 

Answer:

Here is a version in a functional programming style:

function innerHTML($node) {
    return implode(array_map([$node->ownerDocument,"saveHTML"], 
                             iterator_to_array($node->childNodes)));
}

Answer:

To return the html of an element, you can use C14N():

$dom = new DOMDocument();
$dom->loadHtml($html);
$x = new DOMXpath($dom);
foreach($x->query('//table') as $table){
    echo $table->C14N();
}

Answer:

A simplified version of Haim Evgi’s answer:

<?php

function innerHTML(\DOMElement $element)
{
    $doc = $element->ownerDocument;

    $html = '';

    foreach ($element->childNodes as $node) {
        $html .= $doc->saveHTML($node);
    }

    return $html;
}

Example usage:

<?php

$doc = new \DOMDocument();
$doc->loadHTML("<body><div id='foo'><p>This is <b>an <i>example</i></b> paragraph<br>\n\ncontaining newlines.</p><p>This is another paragraph.</p></div></body>");

print innerHTML($doc->getElementById('foo'));

/*
<p>This is <b>an <i>example</i></b> paragraph<br>

containing newlines.</p>
<p>This is another paragraph.</p>
*/

There’s no need to set preserveWhiteSpace or formatOutput.

Answer:

In addition to trincot’s nice version with array_map and implode but this time with array_reduce:

return array_reduce(
   iterator_to_array($node->childNodes),
   function ($carry, \DOMNode $child) {
        return $carry.$child->ownerDocument->saveHTML($child);
   }
);

Still don’t understand, why there’s no reduce() method which accepts arrays and iterators alike.

Answer:

function setnodevalue($doc, $node, $newvalue){
  while($node->childNodes->length> 0){
    $node->removeChild($node->firstChild);
  }
  $fragment= $doc->createDocumentFragment();
  $fragment->preserveWhiteSpace= false;
  if(!empty($newvalue)){
    $fragment->appendXML(trim($newvalue));
    $nod= $doc->importNode($fragment, true);
    $node->appendChild($nod);
  }
}

Answer:

Here’s another approach based on this comment by Drupella on php.net, that worked well for my project. It defines the innerHTML() by creating a new DOMDocument, importing and appending to it the target node, instead of explicitly iterating over child nodes.

InnerHTML

Let’s define this helper function:

function innerHTML( \DOMNode $n, $include_target_tag = true ) {
  $doc = new \DOMDocument();
  $doc->appendChild( $doc->importNode( $n, true ) );
  $html = trim( $doc->saveHTML() );
  if ( $include_target_tag ) {
      return $html;
  }
  return preg_replace( '@^<' . $n->nodeName .'[^>]*>|</'. $n->nodeName .'>$@', '', $html );
}

where we can include/exclude the outer target tag through the second input argument.

Usage Example

Here we extract the inner HTML for a target tag given by the “first” id attribute:

$html = '<div id="first"><h1>Hello</h1></div><div id="second"><p>World!</p></div>';
$doc  = new \DOMDocument();
$doc->loadHTML( $html );
$node = $doc->getElementById( 'first' );

if ( $node instanceof \DOMNode ) {

    echo innerHTML( $node, true );
    // Output: <div id="first"><h1>Hello</h1></div>    

    echo innerHTML( $node, false );
    // Output: <h1>Hello</h1>
}

Live example:

http://sandbox.onlinephpfunctions.com/code/2714ea116aad9957c3c437d46134a1688e9133b8

Answer:

Old query, but there is a built-in method to do that. Just pass the target node to DomDocument->saveHtml().

Full example:

$html = '<div><p>ciao questa è una <b>prova</b>.</p></div>';
$dom = new DomDocument($html);
@$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$node = $xpath->query('.//div/*'); // with * you get inner html without surrounding div tag; without * you get inner html with surrounding div tag
$innerHtml = $dom->saveHtml($node);
var_dump($innerHtml);

Output: <p>ciao questa è una <b>prova</b>.</p>

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