php update에서 적용이 되지 않습니다.

      session_start();       if (isset($_SESSION["userid"])) $userid = $_SESSION["userid"];       else $userid = "";       if (isset($_SESSION["username"])) $username = $_SESSION["username"];       else $username = "";       if (isset($_SESSION["userpass"])) $userpass = $_SESSION["userpass"];       else $userpass = "";

    $old_title_name = $_POST["old_title_name"];     $new_title_name = $_POST["title_name"];     $genre = $_POST["genre"];     $introduction = $_POST["introduction"];

    $regist_day = date("Y-m-d (H:i)");  // 현재의 '년-월-일-시-분'을 저장

    $upload_dir = './img/';

    $upfile_name     = $_FILES["upfile"]["name"];       $upfile_tmp_name = $_FILES["upfile"]["tmp_name"];       $upfile_type     = $_FILES["upfile"]["type"];       $upfile_size     = $_FILES["upfile"]["size"];       $upfile_error    = $_FILES["upfile"]["error"];

    if ($upfile_name && !$upfile_error)       {           $file = explode(".", $upfile_name);           $file_name = $file[0];           $file_ext  = $file[1];

          $new_file_name = date("Y_m_d_H_i_s");           $new_file_name = $upfile_name.$new_file_name;           $copied_file_name = $new_file_name.".".$file_ext;           $uploaded_file = $upload_dir.$copied_file_name;

          if( $upfile_size  > 20000000 ) {  //20메가                   echo("                                      ");                   exit;           }

          if (!move_uploaded_file($upfile_tmp_name, $uploaded_file) )           {                   echo("                                          ");                   exit;           }       }

    $con = mysqli_connect("localhost", "user1", "12345", "testdb");     //DB 연결 후 한글코드 세팅     mysqli_set_charset($con, 'utf8');

    $sql = "update uploadnovel set title_name='$new_title_name', genre='$genre' , upfile_name='$upfile_name', upfile_type='$upfile_type', file_copied='$file_copied', introduction='$introduction',  where id='$id' AND title_name='$old_title_name'";

    mysqli_query($con, $sql);     mysqli_close($con);

    echo "             "; ?>  

php.ini를 건들여서 오류는 안나지만 적용이 되지 않습니다... ㅠㅠ