Check for PDO Results, If None Display Message, If Yes then Loop Through

PHP Snippet 1:

$results = $stm->fetchAll();
if(empty($results))//or  if(!$results)  or  if(count($results)==0)  or if($results == array())
{
    echo 'Nothing found';
}
else
{
    foreach($results as $result)
    {
        //do stuff
    }
}

PHP Snippet 2:

$stm->execute();

if($stm->rowCount() == 0)
{
    echo 'Nothing found';
}
else
{
    //do your stuff
}