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PHP - Manual: DOMDocument::saveHTML

2024-12-24

DOMDocument::saveHTML

(PHP 5, PHP 7, PHP 8)

DOMDocument::saveHTML Dumps the internal document into a string using HTML formatting

说明

public DOMDocument::saveHTML(?DOMNode $node = null): string|false

Creates an HTML document from the DOM representation. This function is usually called after building a new dom document from scratch as in the example below.

参数

node

Optional parameter to output a subset of the document.

返回值

Returns the HTML, or false if an error occurred.

范例

示例 #1 Saving a HTML tree into a string

<?php

$doc 
= new DOMDocument('1.0');

$root $doc->createElement('html');
$root $doc->appendChild($root);

$head $doc->createElement('head');
$head $root->appendChild($head);

$title $doc->createElement('title');
$title $head->appendChild($title);

$text $doc->createTextNode('This is the title');
$text $title->appendChild($text);

echo 
$doc->saveHTML();

?>

参见

add a noteadd a note

User Contributed Notes 18 notes

up
46
tomas dot strejcek at ghn dot cz
5 years ago
As of PHP 5.4 and Libxml 2.6, there is currently simpler approach:

when you load html as this

$html->loadHTML($content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

in the output, there will be no doctype, html or body tags
up
19
sasha @ goldnet dot ca
4 years ago
When saving HTML fragment initiated with LIBXML_HTML_NOIMPLIED option, it will end up being "broken" as libxml requires root element. libxml will attempt to fix the fragment by adding closing tag at the end of string based on the first opened tag it encounters in the fragment.

For an example:

<h1>Foo</h1><p>bar</p>

will end up as:

<h1>Foo<p>bar</p></h1>

Easiest workaround is adding root tag yourself and stripping it later:

$html->loadHTML('<html>' . $content .'</html>', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

$content = str_replace(array('<html>','</html>') , '' , $html->saveHTML());
up
25
m at hbblogs daught calm
13 years ago
This method, as of 5.2.6, will automatically add <html><body> and <!DOCTYPE> tags to the document if they are missing, without asking whether you want them. In my application, I needed to use the DOM methods to manipulate just a fragment of html, so these tags were rather unhelpful.

Here's a simple hack to remove them in case, like me, all you wanted to do was perform a few operations on an HTML fragment.

$html_fragment = preg_replace('/^<!DOCTYPE.+?>/', '', str_replace( array('<html>', '</html>', '<body>', '</body>'), array('', '', '', ''), $dom->saveHTML()));
up
4
contact at cathexis dot de
5 years ago
If you load HTML from a string ensure the charset is set.

<?php
...
$html_src = '<html><head><meta content="text/html; charset=utf-8" http-equiv="Content-Type"></head><body>';
$html_src .= '...';
...
?>

Otherwise the charset will be ISO-8859-1!
up
12
Bart Feenstra
13 years ago
I am using this solution to prevent tags and the doctype from being added to the HTML string automatically:

<?php
$html
= '<h1>Hello world!</h1>';
$html = '<div>' . $html . '</div>';
$doc = new DOMDocument;
$doc->loadHTML($html);
echo
substr($doc->saveXML($doc->getElementsByTagName('div')->item(0)), 5, -6)

// Outputs: "<h1>Hello world!</h1>"
?>
up
6
alvaro at demogracia dot com
11 years ago
Since PHP/5.3.6, DOMDocument->saveHTML() accepts an optional DOMNode parameter similarly to DOMDocument->saveXML():

http://bugs.php.net/bug.php?id=39771
up
1
RiKdnUA at mail dot ru
7 years ago
Tested in PHP 5.2.9-2 and PHP 5.2.17.
saveHTML() игнорирует свойство DOMDocument->encoding. Метод saveHTML() сохраняет html-документ в кодировке, которая указана в теге <meta> исходного (загруженного) html-документа.
saveHTML() ignores property DOMDocument->encoding. Method saveHTML() saves the html-document encoding, which is specified in the tag <meta> source (downloaded) html-document.
Example:
file.html. Кодировка файла должна совпадать с указанной в теге <meta>. The encoding of the file must match the specified tag <meta>.
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
<title>Russian language</title></head>
<body>Русский язык</body></html>

<?php
error_reporting
(-1);
$document=new domDocument('1.0', 'UTF-8');
$document->preserveWhiteSpace=false;
$document->loadHTMLFile('file.html');
$document->formatOutput=true;
$document->encoding='UTF-8';
$htm=$document->saveHTML();
echo
"Записано байт. Recorded bytes: ".file_put_contents('file_new.html', $htm);
?>
file_new.html будет в кодировке Windows-1251 (НЕ в UTF-8).
file_new.html will be encoded in Windows-1251 (not in UTF-8).

saveHTML() и file_put_contents() позволяют преодолеть недостаток метода saveHTMLFile().
Смотрите мой комментарий к методу saveHTMLFile().
saveHTML() and file_put_contents() allows you to overcome the lack of a method saveHTMLFile().
See my comment on the method saveHTMLFile().
http://php.net/manual/ru/domdocument.savehtmlfile.php
up
1
jeboy
4 years ago
LIBXML_HTML_NOIMPLIED doesn't work on PHP 7.1.9 with libxml2-2.7.8
up
0
Anonymous
6 years ago
To solve the script tag problem just add an empty text node to the script node and DOMDocument will render <script src="your.js"></script> nicely.
up
1
Anonymous
13 years ago
To avoid script tags from being output as <script />, you can use the DOMDocumentFragment class:

<?php

$doc
= new DOMDocument();
$doc -> loadXML($xmlstring);
$fragment = $doc->createDocumentFragment();
/* Append the script element to the fragment using raw XML strings (will be preserved in their raw form) and if succesful proceed to insert it in the DOM tree */
if($fragment->appendXML("<script type='text/javascript' src='$source'></script>") {
 
$xpath = new DOMXpath($doc);
 
$resultlist = $xpath->query("//*[local-name() = 'html']/*[local-name() = 'head']"); /* namespace-safe method to find all head elements which are childs of the html element, should only return 1 match */
 
foreach($resultlist as $headnode// insert the script tag
    
$headnode->appendChild($fragment);
}
$doc->saveXML(); /* and our script tags will still be <script></script> */

?>
up
0
Anonymous
12 years ago
If you want a simpler way to get around the <script> tag problem try:

<?php

  $script
= $doc->createElement ('script');\
 
// Creating an empty text node forces <script></script>
 
$script->appendChild ($doc->createTextNode (''));
 
$head->appendChild ($script);

?>
up
-2
qrworld.net
7 years ago
In this post http://softontherocks.blogspot.com/2014/11/descargar-el-contenido-de-una-url_11.html I found a simple way to get the content of a URL with DOMDocument, loadHTMLFile and saveHTML().

function getURLContent($url){
    $doc = new DOMDocument;
    $doc->preserveWhiteSpace = FALSE;
    @$doc->loadHTMLFile($url);
    return $doc->saveHTML();
}
up
0
archanglmr at yahoo dot com
14 years ago
If created your DOMDocument object using loadHTML() (where the source is from another site) and want to pass your changes back to the browser you should make sure the HTTP Content-Type header matches your meta content-type tags value because modern browsers seem to ignore the meta tag and trust just the HTTP header. For example if you're reading an ISO-8859-1 document and your web server is claiming UTF-8 you need to correct it using the header() function.

<?php
header
('Content-Type: text/html; charset=iso-8859-1');
?>
up
0
xoplqox
14 years ago
XHTML:

If the output is XHTML use the function saveXML().

Output example for saveHTML:

<select name="pet" size="3" multiple>
    <option selected>mouse</option>
    <option>bird</option>
    <option>cat</option>
</select>

XHTML conform output using saveXML:

<select name="pet" size="3" multiple="multiple">
    <option selected="selected">mouse</option>
    <option>bird</option>
    <option>cat</option>
</select>
up
-1
Yajo
11 years ago
Another way to workaround the <script/> problem is putting a semicolon (;) inside the script element.
up
-1
tyson at clugg dot net
17 years ago
<?php
// Using DOM to fix sloppy HTML.
// An example by Tyson Clugg <tyson@clugg.net>
//
// vim: syntax=php expandtab tabstop=2

function tidyHTML($buffer)
{
 
// load our document into a DOM object
 
$dom = @DOMDocument::loadHTML($buffer);
 
// we want nice output
 
$dom->formatOutput = true;
  return(
$dom->saveHTML());
}

// start output buffering, using our nice
// callback funtion to format the output.
ob_start("tidyHTML");

?>
<html>
<p>It's like comparing apples to oranges.
</html>
<?php

// this will be called implicitly, but we'll
// call it manually to illustrate the point.
ob_end_flush();

?>

The above code takes out sloppy HTML:
<html>
<p>It's like comparing apples to oranges.
</html>

And cleans it up to the following:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><p>It's like comparing apples to oranges.
</p></body></html>
up
-2
Anonymous
14 years ago
<?php
function getDOMString($retNode) {
  if (!
$retNode) return null;
 
$retval = strtr($retNode-->ownerDocument->saveXML($retNode),
  array(
   
'></area>' => ' />',
   
'></base>' => ' />',
   
'></basefont>' => ' />',
   
'></br>' => ' />',
   
'></col>' => ' />',
   
'></frame>' => ' />',
   
'></hr>' => ' />',
   
'></img>' => ' />',
   
'></input>' => ' />',
   
'></isindex>' => ' />',
   
'></link>' => ' />',
   
'></meta>' => ' />',
   
'></param>' => ' />',
   
'default:' => '',
   
// sometimes, you have to decode entities too...
   
'&quot;' => '&#34;',
   
'&amp;' =>  '&#38;',
   
'&apos;' => '&#39;',
   
'&lt;' =>   '&#60;',
   
'&gt;' =>   '&#62;',
   
'&nbsp;' => '&#160;',
   
'&copy;' => '&#169;',
   
'&laquo;' => '&#171;',
   
'&reg;' =>   '&#174;',
   
'&raquo;' => '&#187;',
   
'&trade;' => '&#8482;'
 
));
  return
$retval;
}
?>
up
-1
mjaque at ilkebenson dot com
14 years ago
DOMDocument->saveXML() doesn't generate a proper XHTML format either.

There is a problem with "script" empty elements. For example:

This will be the code generated by saveXML, with an empty script tag.

<html>
  <head>
    <script type="text/JavaScript" src="myScript.js"/>
  </head>
  <body>
    <p>I will not appear</p>
    <script type="text/JavaScript">
    alert("Not working");
    </script>
  </body>
</html>

I don't know if this is valid XHTML (W3C Validator doesn't complain), but both FF 2.0 and IE 6 will not render it properly. Both will use </script> as the closing tag for the first script causing js errors and ignoring in between elements.

You can post-process saveXML string in order to close empty tags with the following function:

<?php
   
function cerrarTag($tag, $xml){
       
$indice = 0;
        while (
$indice< strlen($xml)){
           
$pos = strpos($xml, "<$tag ", $indice);
            if (
$pos){
               
$posCierre = strpos($xml, ">", $pos);
                if (
$xml[$posCierre-1] == "/"){
                   
$xml = substr_replace($xml, "></$tag>", $posCierre-1, 2);
                }
               
$indice = $posCierre;
            }
            else break;
        }
        return
$xml;
    }
?>

At least script and select empty elements should be closed. This example shows how it can be used:

<?php
    define
("CABECERA_XHTML", '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">');

 
$xhtml = $docXML->saveXML($docXML->documentElement);
 
$xhtml = cerrarTag("script", $xhtml);
 
$xhtml = cerrarTag("select", $xhtml);
 
$xhtml = CABECERA_XHTML."\n".$xhtml;
  echo
$xhtml;
?>

官方地址:https://www.php.net/manual/en/domdocument.savehtml.php

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