$sql = "UPDATE `library_texts` SET `name`='" . mysql_real_escape_string($_POST['name']) . "', " . ($_POST['text'] != 'do_not_change' ? " `text`='" . mysql_real_escape_string($_POST['text']) . "', " : '') . " " . (isset($_POST['move']) ? '`cat_id`=' . intval($_POST['move']) . ', ' : '') . " `announce`='" . mysql_real_escape_string(mb_substr(trim($_POST['announce']), 0, 500)) . "' " . ($adm ? ", `count_views`=" . `premod`=" . intval($_POST['premod']) . ", `comments`=" . (isset($_POST['comments']) ? intval($_POST['comments']) : 0) : '') . " WHERE `id`=" . $id;убираю
`announce`='" . mysql_real_escape_string(mb_substr(trim($_POST['announce']), 0, 500)) . "'