Help Combat Forum SPAMMERS

$c = $modx->newQuery('modResource');
$c->where(array('id:>' => 9999); // Replace 9999 with the id 1 less than the oldest spam post

/* get all recent posts */
$docs = $modx->getCollection('modResource', $c);

$output = "<ul>\n";
foreach ($docs as $doc) {
   $uid = $doc->get('createdby');
   $user = $modx->getObject('modUser', $uid);
   if ($user === null) {
       /* orphaned post  */
       $output .= "\n    <li>" . $doc->get('pagetitle') . '</li>';
       // $doc->remove();  // uncomment if the results look OK
   }
   $output .= "\n</li>";   
}

return $output;