How can i update dynamic textbox values into database table on same ID using php?i hvae two table one is user and other is user family` $result = mysqli_query($conn, $sql3);

            $itemCount = count($_POST["familyname"]);
            $i = 0;
            while ($i < $size) { 
                $familyname = $_POST['familyname'][$i];
                $frelationsh = $_POST['frelationsh'][$i];
                $fieldtype = $_POST['fieldtype'][$i]; 
                $pid = $_POST['pid'][$i];
                $update="UPDATE familydata SET familyname='$familyname', frelationsh='$frelationsh', fgender='$fgender', ''fbirthn='$fbirthn' WHERE pid='$pid'";
              
            }
                    
                print_r($update);
                exit();