DOMDocument::loadHTMLFile

(PHP 5, PHP 7, PHP 8)

DOMDocument::loadHTMLFile — Load HTML from a file

Descrizione

public DOMDocument::loadHTMLFile(string $filename, int $options = 0): bool

The function parses the HTML document in the file named filename. Unlike loading XML, HTML does not have to be well-formed to load.

Avviso

This function parses the input using an HTML 4 parser. The parsing rules of HTML 5, which is what modern web browsers use, are different. Depending on the input this might result in a different DOM structure. Therefore this function cannot be safely used for sanitizing HTML.

As an example, some HTML elements will implicitly close a parent element when encountered. The rules for automatically closing parent elements differ between HTML 4 and HTML 5 and thus the resulting DOM structure that DOMDocument sees might be different from the DOM structure a web browser sees, possibly allowing an attacker to break the resulting HTML.

Elenco dei parametri

filename: The path to the HTML file.
options: Bitwise OR of the libxml option constants.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Errori/Eccezioni

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

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.

Log delle modifiche

Versione	Descrizione
8.3.0	This function now has a tentative bool return type.
8.0.0	Calling this function statically will now throw an Error. Previously, an `E_DEPRECATED` was raised.

Esempi

Example #1 Creating a Document

<?php
$doc = new DOMDocument();
$doc->loadHTMLFile("filename.html");
echo $doc->saveHTML();
?>

Vedere anche:

DOMDocument::loadHTML() - Load HTML from a string
DOMDocument::saveHTML() - Dumps the internal document into a string using HTML formatting
DOMDocument::saveHTMLFile() - Dumps the internal document into a file using HTML formatting

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User Contributed Notes 6 notes

down

onemanbanddan at gmail dot com ¶

10 years ago


The options for surpressing errors and warnings will not work with this as they do for loadXML()
e.g.
<?php
$doc->loadHTMLFile($file, LIBXML_NOWARNING | LIBXML_NOERROR);
?>
will not work.
you must use:
<?php
libxml_use_internal_errors(true);
$doc->loadHTMLFile($file);
?>
and handle the exceptions as neccesarry.

down

Mark Omohundro, ajamyajax dot com ¶

15 years ago


<?php
// try this html listing example for all nodes / includes a few getElementsByTagName options:

$file = $DOCUMENT_ROOT. "test.html";
$doc = new DOMDocument();
$doc->loadHTMLFile($file);

// example 1:
$elements = $doc->getElementsByTagName('*');
// example 2:
$elements = $doc->getElementsByTagName('html');
// example 3:
//$elements = $doc->getElementsByTagName('body');
// example 4:
//$elements = $doc->getElementsByTagName('table');
// example 5:
//$elements = $doc->getElementsByTagName('div');

if (!is_null($elements)) {
  foreach ($elements as $element) {
    echo "<br/>". $element->nodeName. ": ";

    $nodes = $element->childNodes;
    foreach ($nodes as $node) {
      echo $node->nodeValue. "\n";
    }
  }
}
?>

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-3

qrworld.net ¶

10 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();
}

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-4

andy at carobert dot com ¶

19 years ago


This puts the HTML into a DOM object which can be parsed by individual tags, attributes, etc..  Here is an example of getting all the 'href' attributes and corresponding node values out of the 'a' tag. Very cool....

<?php
$myhtml = <<<EOF
<html>
<head>
<title>My Page</title>
</head>
<body>
<p><a href="/mypage1">Hello World!</a></p>
<p><a href="/mypage2">Another Hello World!</a></p>
</body>
</html>
EOF;

$doc = new DOMDocument();
$doc->loadHTML($myhtml);

$tags = $doc->getElementsByTagName('a');

foreach ($tags as $tag) {
       echo $tag->getAttribute('href').' | '.$tag->nodeValue."\n";
}
?>

This should output:

/mypage1 | Hello World!
/mypage2 | Another Hello World!

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-17

gzech at SPAMFILTER dot eso dot org ¶

17 years ago


If you want to suppress output warnings from loadHTMLFile($url), put an @ sign in front. This even works in:
<?php
$load = @$dom->loadHTMLFile($url);
?>

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-19

bens at effortlessis dot com ¶

19 years ago


Note that this function doesn't parse the individual tags WITHIN the html file - it's all loaded as a "black box", and you end up with an XML widget that comprises nothing but the complete chunk of HTML. 

I was hoping it would function as a sort of HTML-validator/parser, but that doesn't seem to be the case.

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