DOM
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The DOMDocument class

(PHP 5)

简介

Represents an entire HTML or XML document; serves as the root of the document tree.

类摘要

DOMDocument extends DOMNode {
/* 属性 */
readonly public string $actualEncoding ;
readonly public DOMConfiguration $config ;
readonly public DOMDocumentType $doctype ;
readonly public DOMElement $documentElement ;
public string $documentURI ;
public string $encoding ;
public bool $formatOutput ;
readonly public DOMImplementation $implementation ;
public bool $preserveWhiteSpace = true ;
public bool $recover ;
public bool $resolveExternals ;
public bool $standalone ;
public bool $strictErrorChecking = true ;
public bool $substituteEntities ;
public bool $validateOnParse = false ;
public string $version ;
readonly public string $xmlEncoding ;
public bool $xmlStandalone ;
public string $xmlVersion ;
/* 方法 */
__construct ([ string $version [, string $encoding ]] )
DOMAttr createAttribute ( string $name )
DOMAttr createAttributeNS ( string $namespaceURI , string $qualifiedName )
DOMCDATASection createCDATASection ( string $data )
DOMComment createComment ( string $data )
DOMDocumentFragment createDocumentFragment ( void )
DOMElement createElement ( string $name [, string $value ] )
DOMElement createElementNS ( string $namespaceURI , string $qualifiedName [, string $value ] )
DOMEntityReference createEntityReference ( string $name )
DOMProcessingInstruction createProcessingInstruction ( string $target [, string $data ] )
DOMText createTextNode ( string $content )
DOMElement getElementById ( string $elementId )
DOMNodeList getElementsByTagName ( string $name )
DOMNodeList getElementsByTagNameNS ( string $namespaceURI , string $localName )
DOMNode importNode ( DOMNode $importedNode [, bool $deep ] )
mixed load ( string $filename [, int $options = 0 ] )
bool loadHTML ( string $source )
bool loadHTMLFile ( string $filename )
mixed loadXML ( string $source [, int $options = 0 ] )
void normalizeDocument ( void )
bool registerNodeClass ( string $baseclass , string $extendedclass )
bool relaxNGValidate ( string $filename )
bool relaxNGValidateSource ( string $source )
int save ( string $filename [, int $options ] )
string saveHTML ([ DOMNode $node = NULL ] )
int saveHTMLFile ( string $filename )
string saveXML ([ DOMNode $node [, int $options ]] )
bool schemaValidate ( string $filename )
bool schemaValidateSource ( string $source )
bool validate ( void )
int xinclude ([ int $options ] )
/* 继承的方法 */
public DOMNode DOMNode::appendChild ( DOMNode $newnode )
public string DOMNode::C14N ([ bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] )
public int DOMNode::C14NFile ( string $uri [, bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] )
public DOMNode DOMNode::cloneNode ([ bool $deep ] )
public int DOMNode::getLineNo ( void )
public string DOMNode::getNodePath ( void )
public bool DOMNode::hasAttributes ( void )
public bool DOMNode::hasChildNodes ( void )
public DOMNode DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] )
public bool DOMNode::isDefaultNamespace ( string $namespaceURI )
public bool DOMNode::isSameNode ( DOMNode $node )
public bool DOMNode::isSupported ( string $feature , string $version )
public string DOMNode::lookupNamespaceURI ( string $prefix )
public string DOMNode::lookupPrefix ( string $namespaceURI )
public void DOMNode::normalize ( void )
public DOMNode DOMNode::removeChild ( DOMNode $oldnode )
public DOMNode DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode )
}

属性

actualEncoding

Deprecated. Actual encoding of the document, is a readonly equivalent to encoding.

config

Deprecated. Configuration used when DOMDocument::normalizeDocument() is invoked.

doctype

The Document Type Declaration associated with this document.

documentElement

This is a convenience attribute that allows direct access to the child node that is the document element of the document.

documentURI

The location of the document or NULL if undefined.

encoding

Encoding of the document, as specified by the XML declaration. This attribute is not present in the final DOM Level 3 specification, but is the only way of manipulating XML document encoding in this implementation.

formatOutput

Nicely formats output with indentation and extra space.

implementation

The DOMImplementation object that handles this document.

preserveWhiteSpace

Do not remove redundant white space. Default to TRUE.

recover

Proprietary. Enables recovery mode, i.e. trying to parse non-well formed documents. This attribute is not part of the DOM specification and is specific to libxml.

resolveExternals

Set it to TRUE to load external entities from a doctype declaration. This is useful for including character entities in your XML document.

standalone

Deprecated. Whether or not the document is standalone, as specified by the XML declaration, corresponds to xmlStandalone.

strictErrorChecking

Throws DOMException on errors. Default to TRUE.

substituteEntities

Proprietary. Whether or not to substitute entities. This attribute is not part of the DOM specification and is specific to libxml.

validateOnParse

Loads and validates against the DTD. Default to FALSE.

version

Deprecated. Version of XML, corresponds to xmlVersion.

xmlEncoding

An attribute specifying, as part of the XML declaration, the encoding of this document. This is NULL when unspecified or when it is not known, such as when the Document was created in memory.

xmlStandalone

An attribute specifying, as part of the XML declaration, whether this document is standalone. This is FALSE when unspecified.

xmlVersion

An attribute specifying, as part of the XML declaration, the version number of this document. If there is no declaration and if this document supports the "XML" feature, the value is "1.0".

注释

Note:

The DOM extension uses UTF-8 encoding. Use utf8_encode() and utf8_decode() to work with texts in ISO-8859-1 encoding or Iconv for other encodings.

参见

Table of Contents

DOM
在线手册：中文 英文
PHP手册
PHP手册 - N: The DOMDocument class

用户评论:

Nick M (01-Jun-2011 06:16)

You may need to save all or part of a DOMDocument as an XHTML-friendly string, something compliant with both XML and HTML 4. Here's the DOMDocument class extended with a saveXHTML method:

<?php

/**
 * XHTML Document
 *
 * Represents an entire XHTML DOM document; serves as the root of the document tree.
 */
class XHTMLDocument extends DOMDocument {

  /**
   * These tags must always self-terminate. Anything else must never self-terminate.
   *
   * @var array
   */
  public $selfTerminate = array(
      'area','base','basefont','br','col','frame','hr','img','input','link','meta','param'
  );
 
  /**
   * saveXHTML
   *
   * Dumps the internal XML tree back into an XHTML-friendly string.
   *
   * @param DOMNode $node
   *         Use this parameter to output only a specific node rather than the entire document.
   */
  public function saveXHTML(DOMNode $node=null) {
   
    if (!$node) $node = $this->firstChild;
   
    $doc = new DOMDocument('1.0');
    $clone = $doc->importNode($node->cloneNode(false), true);
    $term = in_array(strtolower($clone->nodeName), $this->selfTerminate);
    $inner='';
   
    if (!$term) {
      $clone->appendChild(new DOMText(''));
      if ($node->childNodes) foreach ($node->childNodes as $child) {
        $inner .= $this->saveXHTML($child);
      }
    }
   
    $doc->appendChild($clone);
    $out = $doc->saveXML($clone);
   
    return $term ? substr($out, 0, -2) . ' />' : str_replace('><', ">$inner<", $out);

  }

}

?>

This hasn't been benchmarked, but is probably significantly slower than saveXML or saveHTML and should be used sparingly.

evert at er dot nl (20-Nov-2010 10:17)

A nice and simple node 2 array I wrote, worth a try ;)

<?php
function getArray($node)
{
    $array = false;

    if ($node->hasAttributes())
    {
        foreach ($node->attributes as $attr)
        {
            $array[$attr->nodeName] = $attr->nodeValue;
        }
    }

    if ($node->hasChildNodes())
    {
        if ($node->childNodes->length == 1)
        {
            $array[$node->firstChild->nodeName] = $node->firstChild->nodeValue;
        }
        else
        {
            foreach ($node->childNodes as $childNode)
            {
                if ($childNode->nodeType != XML_TEXT_NODE)
                {
                    $array[$childNode->nodeName][] = $this->getArray($childNode);
                }
            }
        }
    }

    return $array;
}
?>

nathan at crause dot name (30-Jul-2010 05:35)

Be careful with any assumptions you may have about this library. Unlike XML parsers in other languages (such as Java), when parsing an XML Schema constrained XML document, defaults you may define (such as for attributes) will NOT be correctly represented in the DOMDocument.

hutch one two zero at gmail dot com (26-Apr-2010 06:47)

If you're using AJAX, make sure you put a header directive like the following at the top of your php file.

<?php header( "content-type: application/xml; charset=ISO-8859-15" ); ?>

If you don't add this header then your javascript downloadURL function will not work because the content type will not be recognised to be XML.

me at richardsnazell dot com (30-Mar-2010 02:34)

After running into a problem with DomDocument and a UTF-8 encoded input string, a simple work-around was to convert the input string to ISO-8859-1, run my DOM queries, then convert back to UTF-8:

<?php
$xhtml = 'a UTF-8 encoded string';
$xhtml = utf8_decode($xhtml); // convert UTF-8 string to ISO-8859-1

// doing some DOM manipulation here on $xhtml

$xhtml = utf8_encode($xhtml); // convert ISO-8859-1 string back to UTF-8
?>

Not ideal - but it worked for me.

admin at beerpla dot net (12-Mar-2010 10:12)

After seeing many complaints about certain DOMDocument shortcomings, such as bad handling of encodings and always saving HTML fragments with <html>, <head>, and DOCTYPE, I decided that a better solution is needed.

So here it is: SmartDOMDocument. You can find it at http://beerpla.net/projects/smartdomdocument/

Currently, the main highlights are:

- SmartDOMDocument inherits from DOMDocument, so it's very easy to use - just declare an object of type SmartDOMDocument instead of DOMDocument and enjoy the new behavior on top of all existing functionality (see example below).

- saveHTMLExact() - DOMDocument has an extremely badly designed "feature" where if the HTML code you are loading does not contain <html> and <body> tags, it adds them automatically (yup, there are no flags to turn this behavior off).
Thus, when you call $doc->saveHTML(), your newly saved content now has <html><body> and DOCTYPE in it. Not very handy when trying to work with code fragments (XML has a similar problem).
SmartDOMDocument contains a new function called saveHTMLExact() which does exactly what you would want - it saves HTML without adding that extra garbage that DOMDocument does.

- encoding fix - DOMDocument notoriously doesn't handle encoding (at least UTF-8) correctly and garbles the output.
SmartDOMDocument tries to work around this problem by enhancing loadHTML() to deal with encoding correctly. This behavior is transparent to you - just use loadHTML() as you would normally.

- SmartDOMDocument Object As String - you can use a SmartDOMDocument object as a string which will print out its contents.
For example:
<?php
echo "Here is the HTML: $smart_dom_doc";
?>

I'm going to maintain this code and try to fix bugs as they come in.

Enjoy.

tloach at gmail dot com (05-Feb-2010 06:01)

For anyone else who has been having issues with formatOuput not working, here is a work-around:

rather than just doing something like:

<?php
$outXML = $xml->saveXML();
?>

force it to reload the XML from scratch, then it will format correctly:

<?php
$outXML = $xml->saveXML();
$xml = new DOMDocument();
$xml->preserveWhiteSpace = false;
$xml->formatOutput = true;
$xml->loadXML($outXML);
$outXML = $xml->saveXML();
?>

jay at jaygilford dot com (27-Jan-2010 04:46)

Here's a small function I wrote to get all page links using the DOMDocument which will hopefully be of use to others

<?php
/**
 * @author Jay Gilford
 */
 
/**
 * get_links()
 *
 * @param string $url
 * @return array
 */
function get_links($url) {
 
    // Create a new DOM Document to hold our webpage structure
    $xml = new DOMDocument();
 
    // Load the url's contents into the DOM
    $xml->loadHTMLFile($url);
 
    // Empty array to hold all links to return
    $links = array();
 
    //Loop through each <a> tag in the dom and add it to the link array
    foreach($xml->getElementsByTagName('a') as $link) {
        $links[] = array('url' => $link->getAttribute('href'), 'text' => $link->nodeValue);
    }
 
    //Return the links
    return $links;
}
?>

fcartegnie (31-Oct-2009 09:30)

Be careful with formatOutput().

Creating an empty node like this:
createElement('foo','')
instead of
createElement('foo')
will break formatOutput.

Yarg Dahc (06-Oct-2009 01:08)

Child class of DOMDocument which has a toArray() method. Enjoy and/or improve
<?php
class MyDOMDocument extends DOMDocument
{
    public function toArray(DOMNode $oDomNode = null)
    {
        // return empty array if dom is blank
        if (is_null($oDomNode) && !$this->hasChildNodes()) {
            return array();
        }
        $oDomNode = (is_null($oDomNode)) ? $this->documentElement : $oDomNode;
        if (!$oDomNode->hasChildNodes()) {
            $mResult = $oDomNode->nodeValue;
        } else {
            $mResult = array();
            foreach ($oDomNode->childNodes as $oChildNode) {
                // how many of these child nodes do we have?
                // this will give us a clue as to what the result structure should be
                $oChildNodeList = $oDomNode->getElementsByTagName($oChildNode->nodeName); 
                $iChildCount = 0;
                // there are x number of childs in this node that have the same tag name
                // however, we are only interested in the # of siblings with the same tag name
                foreach ($oChildNodeList as $oNode) {
                    if ($oNode->parentNode->isSameNode($oChildNode->parentNode)) {
                        $iChildCount++;
                    }
                }
                $mValue = $this->toArray($oChildNode);
                $sKey   = ($oChildNode->nodeName{0} == '#') ? 0 : $oChildNode->nodeName;
                $mValue = is_array($mValue) ? $mValue[$oChildNode->nodeName] : $mValue;
                // how many of thse child nodes do we have?
                if ($iChildCount > 1) {  // more than 1 child - make numeric array
                    $mResult[$sKey][] = $mValue;
                } else {
                    $mResult[$sKey] = $mValue;
                }
            }
            // if the child is <foo>bar</foo>, the result will be array(bar)
            // make the result just 'bar'
            if (count($mResult) == 1 && isset($mResult[0]) && !is_array($mResult[0])) {
                $mResult = $mResult[0];
            }
        }
        // get our attributes if we have any
        $arAttributes = array();
        if ($oDomNode->hasAttributes()) {
            foreach ($oDomNode->attributes as $sAttrName=>$oAttrNode) {
                // retain namespace prefixes
                $arAttributes["@{$oAttrNode->nodeName}"] = $oAttrNode->nodeValue;
            }
        }
        // check for namespace attribute - Namespaces will not show up in the attributes list
        if ($oDomNode instanceof DOMElement && $oDomNode->getAttribute('xmlns')) {
            $arAttributes["@xmlns"] = $oDomNode->getAttribute('xmlns');
        }
        if (count($arAttributes)) {
            if (!is_array($mResult)) {
                $mResult = (trim($mResult)) ? array($mResult) : array();
            }
            $mResult = array_merge($mResult, $arAttributes);
        }
        $arResult = array($oDomNode->nodeName=>$mResult);
        return $arResult;
    }
}

$sXml = <<<XML
<nodes>
    <node>text<node>
    <node>
        <field>hello<field>
        <field>world<field>
    <node>
<nodes>
XML;
$dom = new MyDOMDocument;
$dom->loadXml($sXml);
var_dump($dom->toArray());
?>
Output:

array (
    "nodes" => array (
        "node" => array (
            0 => "text",
            1 => array (
            "field" => array (
                0 => "hello",
                1 => "world"
            )
        )
    )
 )

PhilipWayneRollins at gmail dot com (15-Aug-2009 09:32)

If you want to use the DOMDocument to create xHTML documents here is a simple class

Note this is designed for creating xHTML documents from scratch but could be easily extended to work with xHTML documents. Also this is for xHTML not XML.

<?php
    class Document
    {
        public $doctype;
        public $head;
        public $title = 'Sensei Ninja';
        public $body;
        private $styles;
        private $metas;
        private $scripts;
        private $document;
       
       
        function __construct (  )
        {
            $this->document = new DOMDocument( );
            $this->head = $this->document->createElement( 'head', ' ' );
            $this->body = $this->document->createElement( 'body', ' ' );
        }
       
       
        public function addStyleSheet ( $url, $media='all' )
        {
            $element = $this->document->createElement( 'link' );
            $element->setAttribute( 'type', 'text/css' );
            $element->setAttribute( 'href', $url );
            $element->setAttribute( 'media', $media );
            $this->styles[] = $element;
        }
       
       
        public function addScript ( $url )
        {
            $element = $this->document->createElement( 'script', ' ' );
            $element->setAttribute( 'type', 'text/javascript' );
            $element->setAttribute( 'src', $url );
            $this->scripts[] = $element;
        }
       
       
        public function addMetaTag ( $name, $content )
        {
            $element = $this->document->createElement( 'meta' );
            $element->setAttribute( 'name', $name );
            $element->setAttribute( 'content', $content );
            $this->metas[] = $element;
        }
       
       
        public function setDescription ( $dec )
        {
            $this->addMetaTag( 'description', $dec );
        }
       
       
        public function setKeywords ( $keywords )
        {
            $this->addMetaTag( 'keywords', $keywords );
        }
       
        public function createElement ( $nodeName, $nodeValue=null )
        {
          return $this->document->createElement( $nodeName, $nodeValue );
        }
       
        public function assemble ( )
        {
            // Doctype creation
            $doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML TRANSITIONAL 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">';
           
            // Create the head element
            $title = $this->document->createElement( 'title', $this->title );
            // Add stylesheets if needed
            if ( is_array( $this->styles ))
                foreach ( $this->styles as $element )
                    $this->head->appendChild( $element );
            // Add scripts if needed
            if(  is_array( $this->scripts ))
                foreach ( $this->scripts as $element )
                    $this->head->appendChild( $element );
            // Add meta tags if needed
            if ( is_array( $this->metas ))
                foreach ( $this->metas as $element )
                    $this->head->appendChild( $element );
            $this->head->appendChild( $title );
           
            // Create the document
            $html = $this->document->createElement( 'html' );
            $html->setAttribute( 'xmlns', 'http://www.w3.org/1999/xhtml' );
            $html->setAttribute( 'xml:lang', 'en' );
            $html->setAttribute( 'lang', 'en' );
            $html->appendChild( $this->head );
            $html->appendChild( $this->body );
           
           
            $this->document->appendChild( $html );
            return $doctype . $this->document->saveXML( );
        }
       
    }
   
?>

Small example

<?php
        $document = new Document( );
    $document->title = 'Hello';
    $document->addStyleSheet( 'StyleSheets/main.css' );
    $div = $document->createElement( 'div' );
    $div->nodeValue = 'Hello, world!';
    $div->setAttribute( 'style', 'color: red;' );
    $document->body->appendChild( $div );
    printf( '%s', $document->assemble( ) );
?>

e dot sand at elisand dot com (19-Jun-2009 05:19)

It should be pointed out that DOMDocument extends DOMNode in every way... that means that you even have access to the DOMNode properties (even though the documentation here does not mention them as being inherited).

I used to use an XPath query to access nodes from a DOMDocument (when getElementById or getElementsByTagName weren't usable), as I believed this to be the only way.  However, since DOMDocument fully extends DOMNode, you can use DOMDocument->firstChild for example to get the first child node.

This simplifies things quite a bit when using an XPath query may seem a bit excessive to get access to something as simple as the child nodes.

cmyk777 at gmail dot com (23-May-2009 08:31)

This function may help to debug current dom element:

<?php
function dom_dump($obj) {
    if ($classname = get_class($obj)) {
        $retval = "Instance of $classname, node list: \n";
        switch (true) {
            case ($obj instanceof DOMDocument):
                $retval .= "XPath: {$obj->getNodePath()}\n".$obj->saveXML($obj);
                break;
            case ($obj instanceof DOMElement):
                $retval .= "XPath: {$obj->getNodePath()}\n".$obj->ownerDocument->saveXML($obj);
                break;
            case ($obj instanceof DOMAttr):
                $retval .= "XPath: {$obj->getNodePath()}\n".$obj->ownerDocument->saveXML($obj);
                //$retval .= $obj->ownerDocument->saveXML($obj);
                break;
            case ($obj instanceof DOMNodeList):
                for ($i = 0; $i < $obj->length; $i++) {
                    $retval .= "Item #$i, XPath: {$obj->item($i)->getNodePath()}\n".
"{$obj->item($i)->ownerDocument->saveXML($obj->item($i))}\n";
                }
                break;
            default:
                return "Instance of unknown class";
        }
    } else {
        return 'no elements...';
    }
    return htmlspecialchars($retval);
}
?>

Example usage:

<?php
$dom = new DomDocument();
$dom->load('test.xml');
$body = $dom->documentElement->getElementsByTagName('book');
echo '<pre>'.dom_dump($body).'<pre>';
?>

Output:

Instance of DOMNodeList, node list:
Item #0, XPath: /library/book[1]
<book isbn="0345342968">
<title>Fahrenheit 451</title>
<author>R. Bradbury</author>
<publisher>Del Rey</publisher>
</book>
Item #1, XPath: /library/book[2]
<book isbn="0048231398">
<title>The Silmarillion</title>
<author>J.R.R. Tolkien</author>
<publisher>G. Allen &amp; Unwin</publisher>
</book>
Item #2, XPath: /library/book[3]
<book isbn="0451524934">
<title>1984</title>
<author>G. Orwell</author>
<publisher>Signet</publisher>
</book>
Item #3, XPath: /library/book[4]
<book isbn="031219126X">
<title>Frankenstein</title>
<author>M. Shelley</author>
<publisher>Bedford</publisher>
</book>
Item #4, XPath: /library/book[5]
<book isbn="0312863551">
<title>The Moon Is a Harsh Mistress</title>
<author>R. A. Heinlein</author>
<publisher>Orb</publisher>
</book>

Atanas Markov (dreamer79bg at gmail dot com) (30-Nov-2008 07:59)

Here is a simple web scraping example using the PHP DOM that tries to get the largest text body of a HTML document. I needed it for a spider that had to show a short description for a page. It assumes that document annotation can be the largest <div>, <td> or <p> element in the page.
In the example I show a way to prevent a bug in the DOM as it sometimes just doesn't recognize html encoding. It seems to work if you put charset meta tag right after the head tag of the document.

<?php
$ch= curl_init();
curl_setopt ($ch, CURLOPT_URL, '...put url here...' );
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch,CURLOPT_VERBOSE,1);
curl_setopt($ch, CURLOPT_USERAGENT, 'set sth...');
curl_setopt ($ch, CURLOPT_REFERER, '...set sth...'); //just a fake referer
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch,CURLOPT_POST,0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 20);

$html= curl_exec($ch);
$html1= curl_getinfo($ch);

//try to get page encoding as it was sent from server
if ($html1['content_type']){
    $arr= explode('charset=',$html1['content_type']);
    $csethdr= strtolower(trim($arr[1]));
} else {
    $csethdr= false;
}

$cset= false;
$arr= array();

//This has to replace page meta tags for charset with utf-8, but it doesn't actually help(see the bug info).
if (preg_match_all(
'/(<meta\s*http-equiv="Content-Type"\s*content="[^;]*;
\s*charset=([^"]*?)(?:"|\;)[^>]*>)/' //merge this line
,$html,$arr,PREG_PATTERN_ORDER)){
    $cset= strtolower(trim($arr[2][0]));
    if ($cset!='utf-8'||$cset!=$csethdr){
        $new= str_replace($arr[2][0],'utf-8',$arr[1][0]);
        $html= str_replace($arr[1][0],$new,$html);
        $cset= $csethdr;
    } else {
        $cset= false;
    }

    if ($cset=='utf-8'){
        $cset= false;
    }
}
unset($arr);
if ($cset){
    $html= iconv($cset,'utf-8',$html);
}
unset($cset);

//solve dom bug
$html=preg_replace('/<head[^>]*>/','<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
',$html);

$dom= new DOMDocument();
$dom->loadHTML($html);
$dom->preserveWhiteSpace = false;

function getMaxTextBody($dom){
    $content = $dom->getElementsByTagname('div');
    $content2= $dom->getElementsByTagname('td');
    $content3= $dom->getElementsByTagname('p');

    $new= array();
    foreach ($content as $value) {
        $new[]= $value;
        unset($value);
    }
    unset($content);

    foreach ($content2 as $value) {
        $new[]= $value;
        unset($value);
    }
    unset($content2);

    foreach ($content3 as $value) {
        $new[]= $value;
        unset($value);
    }
    unset($content3);

    $maxlen= 0;
    $result= '';
    foreach ($new as $item)
    {
        $str= $item->nodeValue;
        if (strlen($str)>$maxlen){
            $content1= $item->getElementsByTagName('div');
            $content2= $item->getElementsByTagname('td');
                        $content3= $item->getElementsByTagname('p');
            $contentnew= array();
            foreach ($content1 as $value) {
                $contentnew[]= $value;
                unset($value);
            }
            unset($content1);
            foreach ($content2 as $value) {
                $contentnew[]= $value;
                unset($value);
            }
            unset($content2);
            foreach ($content3 as $value) {
                $contentnew[]= $value;
                unset($value);
            }
            unset($content3);

            if (count($contentnew)==0){
                $result= $str;
            } else {
                foreach ($contentnew as $value) {
                    $str1= getMaxTextBody($value);
                    $str2= $value->nodeValue;
                        //let's say largest body has more than 50% of the text in its parent
                                    if (strlen($str1)*2<strlen($str2)){
                        $str1= $str2;
                    }
                    if (strlen($str1)*2>strlen($str)&&strlen($str1)>$maxlen){
                        $result= $str1;
                    } elseif (strlen($str1)>$maxlen){
                        $result= $str1;
                    }
                    $maxlen= strlen($result);
                }
            }
            $maxlen= strlen($result);
            unset($contnentnew);
        }
    }

    unset($new);
    return $result;
}
print getMaxTextBody($dom);

?>

Jochem Blok (15-May-2008 02:58)

To indent a XML in a pretty way I use:

<?
$sXML = '<root><element><key>a</key><value>b</value></element></root>';
$doc = new DOMDocument();
$doc->preserveWhiteSpace = false;
$doc->formatOutput   = true;
$doc->loadXML($sXML);
echo $doc->saveXML();
?>

Fernando H (11-Apr-2008 08:48)

Showing a quick example of how to use this class, just so that new users can get a quick start without having to figure it all out by themself. ( At the day of posting, this documentation just got added and is lacking examples. )

<?php

// Set the content type to be XML, so that the browser will   recognise it as XML.
header( "content-type: application/xml; charset=ISO-8859-15" );

// "Create" the document.
$xml = new DOMDocument( "1.0", "ISO-8859-15" );

// Create some elements.
$xml_album = $xml->createElement( "Album" );
$xml_track = $xml->createElement( "Track", "The ninth symphony" );

// Set the attributes.
$xml_track->setAttribute( "length", "0:01:15" );
$xml_track->setAttribute( "bitrate", "64kb/s" );
$xml_track->setAttribute( "channels", "2" );

// Create another element, just to show you can add any (realistic to computer) number of sublevels.
$xml_note = $xml->createElement( "Note", "The last symphony composed by Ludwig van Beethoven." );

// Append the whole bunch.
$xml_track->appendChild( $xml_note );
$xml_album->appendChild( $xml_track );

// Repeat the above with some different values..
$xml_track = $xml->createElement( "Track", "Highway Blues" );

$xml_track->setAttribute( "length", "0:01:33" );
$xml_track->setAttribute( "bitrate", "64kb/s" );
$xml_track->setAttribute( "channels", "2" );
$xml_album->appendChild( $xml_track );

$xml->appendChild( $xml_album );

// Parse the XML.
print $xml->saveXML();

?>

Output:
<Album>
  <Track length="0:01:15" bitrate="64kb/s" channels="2">
    The ninth symphony
    <Note>
      The last symphony composed by Ludwig van Beethoven.
    </Note>
  </Track>
  <Track length="0:01:33" bitrate="64kb/s" channels="2">Highway Blues</Track>
</Album>

If you want your PHP->DOM code to run under the .xml extension, you should set your webserver up to run the .xml extension with PHP ( Refer to the installation/configuration configuration for PHP on how to do this ).

Note that this:
<?php
$xml = new DOMDocument( "1.0", "ISO-8859-15" );
$xml_album = $xml->createElement( "Album" );
$xml_track = $xml->createElement( "Track" );
$xml_album->appendChild( $xml_track );
$xml->appendChild( $xml_album );
?>

is NOT the same as this:
<?php
// Will NOT work.
$xml = new DOMDocument( "1.0", "ISO-8859-15" );
$xml_album = new DOMElement( "Album" );
$xml_track = new DOMElement( "Track" );
$xml_album->appendChild( $xml_track );
$xml->appendChild( $xml_album );
?>

although this will work:
<?php
$xml = new DOMDocument( "1.0", "ISO-8859-15" );
$xml_album = new DOMElement( "Album" );
$xml->appendChild( $xml_album );
?>