PHP - Manual: DOMDocument::loadHTMLFile

2024-11-23

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): DOMDocument|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.

参数

filename: The path to the HTML file.
options: Since Libxml 2.6.0, you may also use the options parameter to specify additional Libxml parameters.

返回值

成功时返回 true，或者在失败时返回 false。 If called statically, returns a DOMDocument 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.

在 PHP 8.0.0 之前可以静态调用此方法，但会发出 E_DEPRECATED 错误。自 PHP 8.0.0 起，静态调用此方法会抛出 Error 异常

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。

范例

示例 #1 Creating a Document


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

参见

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 ¶

8 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 ¶

13 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";
    }
  }
}
?>

down

-1

andy at carobert dot com ¶

17 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!

down

-5

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();
}

down

-15

gzech at SPAMFILTER dot eso dot org ¶

15 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);
?>

down

-18

bens at effortlessis dot com ¶

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

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DOMDocument::loadHTMLFile

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes 6 notes