Я новичок в PHP и следую инструкциям на YouTube. У меня есть все, что работает в этом файле, за исключением загрузки файла, любая помощь будет оценена. Вот ошибка, которую я получаю:

* ПРИМЕЧАНИЕ: я искал это много раз, но не смог найти неопределенную ошибку индекса, относящуюся к $ _FILES ...

Notice: Undefined index: avatar in /Applications/xxx on line 95

Notice: Undefined index: avatar in /Applications/xxx on line 96

Notice: Undefined index: avatar in /Applications/xxx on line 97

Notice: Undefined index: avatar in /Applications/xxx on line 98

Извините за это, если это простое исправление ...

            <?php $title = "Register";?>
        <?php require ("styles/top.php") ; ?>           
        <?php //de-bugging remove this after script works as desired>
        error_reporting(E_ALL);
         ini_set("display_errors", 1); 
        //end de-bugging//

        $form = "<form action='register.php' method='post'>
        <table cellspacing='5px'>
            <tr>
                <td></td>
                <td><font color='red'>*</font> are required fields.</td>
            </tr>
            <tr>
                <td>First Name:</td>
                <td><input type='text' name='firstname' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Last Name:</td>
                <td><input type='text' name='lastname' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Username:</td>
                <td><input type='text' name='username' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Email:</td>
                <td><input type='text' name='email' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Password:</td>
                <td><input type='password' name='password' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Confirm Password:</td>
                <td><input type='password' name='repassword' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Profile Picture:</td>
                <td><input name='avatar' type='file' ></td>
            </tr>
            <tr>
                <td>Profile Message:</td>
                <td><textarea name='bio' cols='35' rows='5' class='textbox'></textarea></td>
            </tr>
            <tr>
                <td></td>
                <td><input type='submit' name='submitbtn' value='Submit' class='button'></td>

            </tr>
        </table>
        </form>";


        if ($_POST['submitbtn']) {

            $firstname = strip_tags($_POST['firstname']);
            $lastname = strip_tags($_POST['lastname']);
            $username = strip_tags($_POST['username']);
            $email = strip_tags($_POST['email']);
            $class = ($_POST['class']);
            $password = strip_tags($_POST['password']);
            $repassword = strip_tags($_POST['repassword']);
            $bio = strip_tags($_POST['bio']);
            //AVATAR UPLOAD
            $name = $_FILES['avatar'] ['name'];
            $type = $_FILES['avatar'] ['type'];
            $size = $_FILES['avatar'] ['size'];
            $tmpname = $_FILES['avatar'] ['tmpname'];
            $ext = substr($name, strrpos($name, '.'));



            if ($firstname && $lastname && $username && $email && $password && $repassword) {
                if ($password == $repassword) {
                    if (strstr($email, "@") && strstr($email, ".") && strlen($email) >= 6) {

                        require("scripts/connect.php");

                        $query = mysql_query("SELECT * FROM users WHERE username ='$username'");
                        $numrows = mysql_num_rows($query);
                        if ($numrows == 0) {

                            $query = mysql_query("SELECT * FROM users WHERE email ='$email'");
                            $numrows = mysql_num_rows($query);
                            if ($numrows == 0) {

                                $pass = (md5(md5($password)));
                                $date = date("F j, Y");

                                if($name){
                                        move_uploaded_file($tmpname, "avatars/$username.$ext");
                                        $avatar = "$username.$ext";
                                        }
                                        else
                                            $avatar = "default_avatar.png";

                                    $code = substr(md5(rand(111111111111, 99999999999999999)), 2, 25);  


                                mysql_query("INSERT INTO users VALUES ('', '$firstname', '$lastname', '$username', '$email', '$pass', '$avatar', '$bio', '', '', '$code', '', '$date')"); 

                                    $webmaster = "xxxx";
                                    $subject = "xxxx";
                                    $headers = "From:xxx<$webmaster>";
                                    $message = "xxx";

                                    mail($email, $subject, $message, $headers);

                                    echo "xxx";

                            }
                            else
                                echo "That email is already taken. $form";
                        }
                        else
                            echo "That username is already taken. $form";

                    }
                    else
                        echo "You did not enter a valid email. $form";

                }
                else
                    echo "Your passwords did not match. $form";
            }
            else
                echo "You did not fill in all of the required fields. $form";

            }
            else
                echo "$form";

            ?>

            </div>
            <?php require ("styles/bottom.php") ; ?>