Disable warnings when loading non-well-formed HTML by DomDocument (PHP)

Call

libxml_use_internal_errors(true);

prior to processing with with $xmlDoc->loadHTML()

This tells libxml2 not to send errors and warnings through to PHP. Then, to check for errors and handle them yourself, you can consult libxml_get_last_error() and/or libxml_get_errors() when you’re ready:

libxml_use_internal_errors(true);
$dom->loadHTML($html);
$errors = libxml_get_errors();
foreach ($errors as $error) {
    // handle the errors as you wish
}