Ho risolto in questo modo.
Codice PHP:
$notizia=$result["news1"];
//$idn1=$result["idn1"];
echo "<img src=stampafoto.php?idn1=$idn1>";
echo"
";
$allowedTags = '<h1>[b][i]<a><ul>[*]<pre><hr><blockquote><img><style>';
$source=strip_tags($notizia, $allowedTags);
echo"<p class=\"news\">$source</p>";