<textarea name=addtext cols=120 rows=20>
</textarea>
...
$text_box=$_REQUEST['addtext'];
...
$sql2="begin b.insert_clob(".$docno.",'".$text_box."'); end;";
$query_txt_ins=OCIParse($ora_connect, $sql2);
OCIExecute($query_txt_ins);
OCIcommit($ora_connect);