Description:
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The first call of htmlentities works OK, but, the next call always return a empty string. When I print_r($res), all values are printed OK

Test script:
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mysql_connect($db_host,$db_user,$db_pass);
mysql_select_db($database);
$sql = "select noticia_id,noticia_datacad,noticia_assunto,noticia_titulo from tab_noticia order by noticia_data desc,categoria_id desc,noticia_id desc limit 15;";
$qry = mysql_query($sql);
$res = mysql_fetch_row($qry);
while ($res) {
        $title = htmlentities($res[3]);
        $subject = htmlentities($res[2]);
        $data = $res[1];
        echo "\t\t\t\t\t<item>\r\n";
        echo "\t\t\t\t\t\t<title>".$titulo."</title>\r\n";
        echo "\t\t\t\t\t\t<description>".$assunto."</description>\r\n";
        echo "\t\t\t\t\t\t<lastBuildDate>".$data."</lastBuildDate>\r\n";
        echo "\t\t\t\t\t\t<link>http://www.the.site/news.php?id=".$id."</link>\r\n";
        echo "\t\t\t\t\t</item>\r\n";
        $res = mysql_fetch_row($qry);
} // end while
mysql_close();