DOMDocument::loadHTMLFile

(PHP 5, PHP 7, PHP 8)

DOMDocument::loadHTMLFile Load HTML from a file

说明

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.

警告

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.

参数

filename

The path to the HTML file.

options

Bitwise OR of the libxml option constants.

返回值

成功时返回 true, 或者在失败时返回 false

错误/异常

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.

尽管非正确格式化的 HTML 仍应该被成功调入,但此函数会在遇到错误标记时产生 E_WARNING 错误。libxml 错误处理函数可以用来处理这类错误。

更新日志

版本 说明
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.

示例

示例 #1 Creating a Document

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

参见

add a note

User Contributed Notes 6 notes

up
13
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.
up
3
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";
}
}
}
?>
up
-2
qrworld.net
9 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
-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!
up
-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);
?>
up
-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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