Validate XML using a custom DTD in PHP

Is there a way (without installing any libraries) of validating XML using a custom DTD in PHP?

From stackoverflow

• Take a look at PHP's DOM, especially DOMDocument::schemaValidate and DOMDocument::validate.

  The example for DOMDocument::validate is fairly simple:

  <?php
  $dom = new DOMDocument;
  $dom->Load('book.xml');
  if ($dom->validate()) {
      echo "This document is valid!\n";
  }
  ?>
  

  Andrei Savu : the only way to get the validation error is to use a custom error handler. really ugly. php sucks at error handling

  Andrei Savu : http://uk3.php.net/manual/en/domdocument.schemavalidate.php#62032 looks like there is a better way than a custom error handler

• Does this help? http://www.topxml.com/php_xml_dom/dom_document_function_validate.asp

  <?php
  
  $doc = new DomDocument;
  
  //declare file variable
  
  $file = 'C:/topxml_demo/php/xml_files/employee.xml';
  
  //declare DTD
  
  $dtd  = 'C:/topxml_demo/php/xml_files/employee.dtd';
  
  // Load the xml file into DOMDocument
  
  $doc->Load($file);
  
  //validate the DOMDocument
  
  if ($doc->validate()) {
  
      print "$file is valid against the DTD.\n";
  
   } else {
  
       print "$file is invalid against the DTD.\n";
  
   }
  
  ?>
  

  nickf : you're not using the $dtd variable anywhere there.