$sorgu = mysql_query("SELECT * FROM arananlar ORDER BY id DESC LIMIT 1");
 
    while($yaz= mysql_fetch_assoc($sorgu))
    { 
    $en_buyuk_id=$yaz['id'];
    }
settype($en_buyuk_id, "integer");
$mm = $en_buyuk_id+1;
$sql = mysql_query("insert into arananlar (aranan,sef,id) values ('$kelime11','$baslik33','$mm')");