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DOMDocument::loadHTML

(PHP 5)

DOMDocument::loadHTML Load HTML from a string

Descrizione

public bool DOMDocument::loadHTML ( string $source [, int $options = 0 ] )

The function parses the HTML contained in the string source. Unlike loading XML, HTML does not have to be well-formed to load. This function may also be called statically to load and create a DOMDocument object. The static invocation may be used when no DOMDocument properties need to be set prior to loading.

Elenco dei parametri

source

The HTML string.

options

Since PHP 5.4.0 and Libxml 2.6.0, you may also use the options parameter to specify additional Libxml parameters.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento. If called statically, returns a DOMDocument o FALSE in caso di fallimento.

Errori/Eccezioni

If an empty string is passed as the source, a warning will be generated. This warning is not generated by libxml and cannot be handled using libxml's error handling functions.

Questo metodo può essere chiamato in modo statico, ma genererà un errore E_STRICT.

Anche se un HTML malformato potrebbe essere caricato con successo, questa funzione può generare errori E_WARNING quando incontra un markup errato. le funzioni di gestione errore di libxml possono essere usate per gestire questi errori.

Esempi

Example #1 Creating a Document

<?php
$doc 
= new DOMDocument();
$doc->loadHTML("<html><body>Test<br></body></html>");
echo 
$doc->saveHTML();
?>

Log delle modifiche

Versione Descrizione
5.4.0 Added options parameter.

Vedere anche:

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User Contributed Notes 11 notes

up
24
mdmitry at gmail dot com
4 years ago
You can also load HTML as UTF-8 using this simple hack:

<?php

$doc
= new DOMDocument();
$doc->loadHTML('<?xml encoding="UTF-8">' . $html);

// dirty fix
foreach ($doc->childNodes as $item)
    if (
$item->nodeType == XML_PI_NODE)
       
$doc->removeChild($item); // remove hack
$doc->encoding = 'UTF-8'; // insert proper

?>
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20
Shane Harter
4 years ago
DOMDocument is very good at dealing with imperfect markup, but it throws warnings all over the place when it does.

This isn't well documented here. The solution to this is to implement a separate aparatus for dealing with just these errors.

Set libxml_use_internal_errors(true) before calling loadHTML. This will prevent errors from bubbling up to your default error handler. And you can then get at them (if you desire) using other libxml error functions.

You can find more info here http://www.php.net/manual/en/ref.libxml.php
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9
hanhvansu at yahoo dot com
7 years ago
When using loadHTML() to process UTF-8 pages, you may meet the problem that the output of dom functions are not like the input. For example, if you want to get "Cạnh tranh", you will receive "Cạnh tranh".  I suggest we use mb_convert_encoding before load UTF-8 page :
<?php
    $pageDom
= new DomDocument();   
   
$searchPage = mb_convert_encoding($htmlUTF8Page, 'HTML-ENTITIES', "UTF-8");
    @
$pageDom->loadHTML($searchPage);

?>
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8
cake at brothercake dot com
1 year ago
Be aware that this function doesn't actually understand HTML -- it fixes tag-soup input using the general rules of SGML, so it creates well-formed markup, but has no idea which element contexts are allowed.

For example, with input like this where the first element isn't closed:

    <span>hello <div>world</div>

loadHTML will change it to this, which is well-formed but invalid:

    <span>hello <div>world</div></span>
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4
bigtree at DONTSPAM dot 29a dot nl
9 years ago
Pay attention when loading html that has a different charset than iso-8859-1. Since this method does not actively try to figure out what the html you are trying to load is encoded in (like most browsers do), you have to specify it in the html head. If, for instance, your html is in utf-8, make sure you have a meta tag in the html's head section:

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>

If you do not specify the charset like this, all high-ascii bytes will be html-encoded. It is not enough to set the dom document you are loading the html in to UTF-8.
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3
Errol
5 years ago
It should be noted that when any text is provided within the body tag
outside of a containing element, the DOMDocument will encapsulate that
text into a paragraph tag (<p>).

For example:
<?php
$doc
= new DOMDocument();
$doc->loadHTML("<html><body>Test<br><div>Text</div></body></html>");
echo
$doc->saveHTML();
?>

will yield:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body>
<p>Test<br></p>
<div>Text</div>
</body></html>

while:
<?php
$doc
= new DOMDocument();
$doc->loadHTML(
   
"<html><body><i>Test</i><br><div>Text</div></body></html>");
echo
$doc->saveHTML();
?>

will yield:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body>
<i>Test</i><br><div>Text</div>
</body></html>
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1
piopier
5 years ago
Here is a function I wrote to capitalize the previous remarks about charset problems (UTF-8...) when using loadHTML and then DOM functions.
It adds the charset meta tag just after <head> to improve automatic encoding detection, converts any specific character to an html entity, thus PHP DOM functions/attributes will return correct values.

<?php
mb_detect_order
("ASCII,UTF-8,ISO-8859-1,windows-1252,iso-8859-15");
function
loadNprepare($url,$encod='') {
       
$content        = file_get_contents($url);
        if (!empty(
$content)) {
                if (empty(
$encod))
                       
$encod  = mb_detect_encoding($content);
               
$headpos        = mb_strpos($content,'<head>');
                if (
FALSE=== $headpos)
                       
$headpos= mb_strpos($content,'<HEAD>');
                if (
FALSE!== $headpos) {
                       
$headpos+=6;
                       
$content = mb_substr($content,0,$headpos) . '<meta http-equiv="Content-Type" content="text/html; charset='.$encod.'">' .mb_substr($content,$headpos);
                }
               
$content=mb_convert_encoding($content, 'HTML-ENTITIES', $encod);
        }
       
$dom = new DomDocument;
       
$res = $dom->loadHTML($content);
        if (!
$res) return FALSE;
        return
$dom;
}
?>

NB: it uses mb_strpos/mb_substr instead of mb_ereg_replace because that seemed more efficient with huge html pages.
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2
jamesedwardcooke+php at gmail dot com
5 years ago
Using loadHTML() automagically sets the doctype property of your DOMDocument instance(to the doctype in the html, or defaults to 4.0 Transitional). If you set the doctype with DOMImplementation it will be overridden.

I assumed it was possible to set it and then load html with the doctype I defined(in order to decide the doctype at runtime), and ran into a huge headache trying to find out where my doctype was going. Hopefully this helps someone else.
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2
romain dot lalaut at laposte dot net
7 years ago
Note that the elements of such document will have no namespace even with <html xmlns="http://www.w3.org/1999/xhtml">
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0
Alex
4 years ago
Beware of the "gotcha" (works as designed but not as expected): if you use loadHTML, you cannot validate the document. Validation is only for XML. Details here: http://bugs.php.net/bug.php?id=43771&edit=1
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0
xuanbn at yahoo dot com
6 years ago
If you use loadHTML() to process utf HTML string (eg in Vietnamese), you may experience result in garbage text, while some files were OK. Even your HTML already have meta charset  like

  <meta http-equiv="content-type" content="text/html; charset=utf-8">

I have discovered that, to help loadHTML() process utf file correctly, the meta tag should come first, before any utf string appear. For example, this HTML file

<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title> Vietnamese - Tiếng Việt</title>
  </head>
<body></body>
</html>

will be OK with loadHTML() when <meta> tag appear <title> tag.

But the file below will not regcornize by loadHTML() because <title> tag contains utf string appear before <meta> tag.

<html>
<head>
    <title> Vietnamese - Tiếng Việt</title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
  </head>
<body></body>
</html>
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