PHP - Manual: DOMDocument::saveHTML

2024-11-23

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

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

add a note

User Contributed Notes 18 notes

down

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

down

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());

down

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()));

down

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!

down

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>"
?>

down

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

down

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

down

jeboy ¶

4 years ago


LIBXML_HTML_NOIMPLIED doesn't work on PHP 7.1.9 with libxml2-2.7.8

down

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.

down

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> */

?>

down

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);

?>

down

-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();
}

down

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');
?>

down

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>

down

-1

Yajo ¶

11 years ago


Another way to workaround the <script/> problem is putting a semicolon (;) inside the script element.

down

-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>

down

-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;

}

?>

down

-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;

?>

add a note

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

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 ADORecordSet对象 PHPMailer设置utf8 PHPMailer字符集CharSet [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 adodb手册 opcache预加载 Composer的Packagist资源 mysql面试题支持php7的性能采集扩展 php扩展开发 PHP7 mcrypt替代方案如何在Composer中为GitLab实例设置访问令牌 php上周一、本周一、下周一日期 php设置cookie为httponly防止xss攻击 PHP json解析（json_decode）页面工具

略微加速

PHP官方手册 - 互联网笔记

DOMDocument::saveHTML

说明

参数

返回值

范例

参见

User Contributed Notes 18 notes