Ошибка в PHP коде [Undefined index}

Question

Помогите чайнику

Notice: Undefined index: full_name in ... on line 10
Notice: Undefined index: login in ... on line 11
Notice: Undefined index: password in ... on line 12
Notice: Undefined index: password_confirm in ... on line 13
Notice: Undefined index: regional_office in ... on line 14
Notice: Undefined index: position_held in ... on line 15
Notice: Undefined index: email in ... on line 16
Notice: Undefined index: phone in ... on line 17
Notice: Undefined index: status in ... on line 18
Notice: Undefined index: avatar in ... on line 25
Notice: Trying to access array offset on value of type null in ... on line 25
Notice: Undefined index: avatar in ... on line 26
Notice: Trying to access array offset on value of type null in ... on line 26
Warning: Cannot modify header information - headers already sent by (output started at ...: 14) in ... on line 30
Warning: Cannot modify header information - headers already sent by (output started at ... :14) in ... on line 60

Сам код

<?php
session_start();

// ...
require_once 'connect.php';


// Получаем данные и фильтруем (удаляем символы html и лишние пробелы) 
$full_name = $_POST['full_name'];
$login = $_POST['login'];
$password = $_POST['password'];
$password_confirm = $_POST['password_confirm'];
$regional_office = $_POST['regional_office'];
$position_held = $_POST['position_held'];
$email = $_POST['email'];
$phone = $_POST['phone'];
$status = $_POST['status'];


// Проверка введенного пароля на сходство
if ($password === $password_confirm) {

    // Загрузка изображения
    $path = 'uploads/avatar/' . time() . $_FILES['avatar']['name'];
    if (!move_uploaded_file($_FILES['avatar']['tmp_name'], '../' . $path)) {
        // Уведомление об ошибке загрузки изображения
        $_SESSION['is_error'] = true;
        $_SESSION['error_message'] = 'Ошибка загрузки изображения';
        header('Location: ../register.php');
    }


    // Шифрование пароля пользователя
    $password = md5($password);


    // Отправка данных
    mysqli_query($connect, &quot;INSERT INTO `users` (`id`, `avatar`, `full_name`, `login`, `password`, `regional_office`, `position_held`, `email`, `phone`, `status`) VALUES (NULL, '$full_name', '$login', '$password', '$regional_office', '$position_held', '$email', '$phone', '$status', '$path');&quot;);



    /*$store_user = $connect-&gt;prepare(&quot;INSERT INTO `users` (`id`, `avatar`, `full_name`, `login`, `password`, `regional_office`, `position_held`, `email`, `phone`, `status`) VALUES (:path, :full_name, :login, :password, :regional_office, :position_held, :email, :phone, :status)&quot;);
    $store_user-&gt;execute([
        &quot;path&quot; =&gt; $path,
        &quot;email&quot; =&gt; $full_name,
        &quot;username&quot; =&gt; $login,
        &quot;password&quot; =&gt; $password,
        &quot;path&quot; =&gt; $regional_office,
        &quot;email&quot; =&gt; $position_held,
        &quot;username&quot; =&gt; $email,
        &quot;password&quot; =&gt; $phone,
        &quot;status&quot; =&gt; $status
    ]);*/


    // Уведомление об успешной регистрации
    $_SESSION['is_success_register'] = true;
    $_SESSION['success_message'] = 'Пользователь зарегистрирован!';
    header('Location: ../register.php');
} else {
    $_SESSION['is_error'] = true;
    $_SESSION['error_message'] = 'Пароли не совпадают';
    header('Location: ../register.php');
}

Могу включить демонстрацию экрана если понадобится