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

I need to parse some HTML files, however, they are not well-formed and PHP prints out warnings to. I want to avoid such debugging/warning behavior programatically. Please advise. Thank you!

Code:

// create a DOM document and load the HTML data
$xmlDoc = new DomDocument;
// this dumps out the warnings
$xmlDoc->loadHTML($fetchResult);

This:

@$xmlDoc->loadHTML($fetchResult)

can suppress the warnings but how can I capture those warnings programatically?