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

Question

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?

Answer 1

You can install a temporary error handler with set_error_handler

class ErrorTrap {
  protected $callback;
  protected $errors = array();
  function __construct($callback) {
    $this->callback = $callback;
  }
  function call() {
    $result = null;
    set_error_handler(array($this, 'onError'));
    try {
      $result = call_user_func_array($this->callback, func_get_args());
    } catch (Exception $ex) {
      restore_error_handler();        
      throw $ex;
    }
    restore_error_handler();
    return $result;
  }
  function onError($errno, $errstr, $errfile, $errline) {
    $this->errors[] = array($errno, $errstr, $errfile, $errline);
  }
  function ok() {
    return count($this->errors) === 0;
  }
  function errors() {
    return $this->errors;
  }
}

Usage:

// create a DOM document and load the HTML data
$xmlDoc = new DomDocument();
$caller = new ErrorTrap(array($xmlDoc, 'loadHTML'));
// this doesn't dump out any warnings
$caller->call($fetchResult);
if (!$caller->ok()) {
  var_dump($caller->errors());
}

Answer 2

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.