XML and PHP

LibXML supports DTD validation, during parsing, and post parsing.

Parse & Validate



<?php
$dom = new domDocument;
$dom->validateOnParse = true;
$dom->load('note-invalid.xml');
?>

Parse Then Validate



<?php
$dom = new domDocument;
$dom->load('note.xml');
if (!$dom->validate('note.dtd')) {
  print "Document note.dtd is not valid\n";
} else {
  print "Document note.dtd is valid\n";
}
?>