(PHP 5, PHP 7, PHP 8)
DOMDocument::loadHTMLFile — Load HTML from a file
   The function parses the HTML document in the file named
   filename. Unlike loading XML, HTML does not have 
   to be  well-formed to load.
  
filenameThe path to the HTML file.
options
       Since Libxml 2.6.0, you may also use the
       options parameter to specify additional Libxml parameters.
      
   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.
  
   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.
  
此方法可以被静态调用,但会抛出一个 E_STRICT 错误。
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。
示例 #1 Creating a Document
<?php
$doc = new DOMDocument();
$doc->loadHTMLFile("filename.html");
echo $doc->saveHTML();
?>