(PHP 5, PHP 7, PHP 8)
DOMDocument::load — Load XML from a file
Loads an XML document from a file.
Unix style paths with forward slashes can cause significant performance degradation on Windows systems; be sure to call realpath() in such a case.
   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。
示例 #1 Creating a Document
<?php
$doc = new DOMDocument();
$doc->load('book.xml');
echo $doc->saveXML();
?>