DiDOM is a PHP library for parsing HTML and XML documents. It is based on the libxml PHP extension, so it inherits some of its features, including the ability to handle malformed documents to some extent.
Libxml, which is the underlying library used by PHP for parsing XML and HTML, provides a way to suppress errors and attempts to parse even malformed documents. When using DiDOM to handle malformed HTML, the library will leverage libxml's ability to handle such documents by repairing them on-the-fly during parsing.
Here is an example of how you might use DiDOM to parse a malformed HTML document while suppressing any errors that might be raised:
<?php
require 'vendor/autoload.php';
use DiDom\Document;
// Example of malformed HTML
$html = '<html><body><p>Paragraph without closing tag</body></html>';
// Create a new Document instance
$document = new Document();
// Suppress libxml errors and enable recovery mode
libxml_use_internal_errors(true);
libxml_clear_errors();
// Load the malformed HTML
$document->loadHtml($html, LIBXML_NOERROR | LIBXML_NOWARNING | LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
// libxml_use_internal_errors(false); // Optional: Disable error suppression if desired
// Now you can work with the document as usual
$paragraphs = $document->find('p');
foreach ($paragraphs as $paragraph) {
echo $paragraph->text(), "\n";
}
// Clear any errors that were suppressed
libxml_clear_errors();
In the code above, libxml_use_internal_errors(true) is used to tell libxml to suppress error reporting, allowing the parsing process to continue despite the presence of malformed markup. The LIBXML_NOERROR | LIBXML_NOWARNING flags are passed to the loadHtml method to further suppress warnings. The LIBXML_HTML_NOIMPLIED and LIBXML_HTML_NODEFDTD flags prevent libxml from adding implied html/body elements and a doctype if they are not found.
Note that while DiDOM and libxml can handle quite a bit of malformed HTML, there are limits to what can be automatically repaired. If your HTML is too far from being well-formed, you might encounter issues with parsing, and the resulting DOM tree may not represent the document as you expect. In such cases, you may need to perform some manual cleanup of the HTML before parsing it with DiDOM.
