登録フォーム：function prepare（）on null

Question

"register.inc.php"ファイルを利用する登録フォーム（SQLデータベースを使用）を作成しようとしています。アカウントを作成しようとすると）私が手

THISエラー： ：

"致命的なエラーは、ライン30上の/usr/www/world/includes/register.inc.phpにヌル上）（準備メンバ関数を呼び出します"私は私のregister.inc.phpからコードを投稿しました。どんな洞察も大変ありがとうございます。

<?php 
include_once 'loginhandler.php'; 
include_once 'DBclass.php'; 

$error_msg = ""; 

if (isset($_POST['username'], $_POST['email'], $_POST['p'])) { 
    // Sanitize and validate the data passed in 
    $username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING); 
    $email = filter_input(INPUT_POST, 'email', FILTER_SANITIZE_EMAIL); 
    $email = filter_var($email, FILTER_VALIDATE_EMAIL); 
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { 
     // Not a valid email 
     $error_msg .= '<p class="error">The email address you entered is not valid</p>'; 
    } 

    $password = filter_input(INPUT_POST, 'p', FILTER_SANITIZE_STRING); 
    if (strlen($password) != 128) { 
     // The hashed pwd should be 128 characters long. 
     // If it's not, something really odd has happened 
     $error_msg .= '<p class="error">Invalid password configuration.</p>'; 
    } 

    // Username validity and password validity have been checked client side. 
    // This should should be adequate as nobody gains any advantage from 
    // breaking these rules. 
    // 

    $prep_stmt = "SELECT id FROM members WHERE email = ? LIMIT 1"; 
    $stmt = $mysqli->prepare($prep_stmt); 

    // check existing email 
    if ($stmt) { 
     $stmt->bind_param('s', $email); 
     $stmt->execute(); 
     $stmt->store_result(); 

     if ($stmt->num_rows == 1) { 
      // A user with this email address already exists 
      $error_msg .= '<p class="error">A user with this email address already exists.</p>'; 
      $stmt->close(); 
     } 
    } else { 
     $error_msg .= '<p class="error">Database error Line 39</p>'; 
     $stmt->close(); 
    } 

    // check existing username 
    $prep_stmt = "SELECT id FROM members WHERE username = ? LIMIT 1"; 
    $stmt = $mysqli->prepare($prep_stmt); 

    if ($stmt) { 
     $stmt->bind_param('s', $username); 
     $stmt->execute(); 
     $stmt->store_result(); 

     if ($stmt->num_rows == 1) { 
      // A user with this username already exists 
      $error_msg .= '<p class="error">A user with this username already exists</p>'; 
      $stmt->close(); 
     } 
    } else { 
     $error_msg .= '<p class="error">Database error line 55</p>'; 
     $stmt->close(); 
    } 

    // TODO: 
    // We'll also have to account for the situation where the user doesn't have 
    // rights to do registration, by checking what type of user is attempting to 
    // perform the operation. 

    if (empty($error_msg)) { 

     // Create hashed password using the password_hash function. 
     // This function salts it with a random salt and can be verified with 
     // the password_verify function. 
     $password = password_hash($password, PASSWORD_BCRYPT); 

     // Insert the new user into the database 
     if ($insert_stmt = $mysqli->prepare("INSERT INTO members (username, email, password) VALUES (?, ?, ?)")) { 
      $insert_stmt->bind_param('sss', $username, $email, $password); 
      // Execute the prepared query. 
      if (! $insert_stmt->execute()) { 
       header('Location: ../error.php?err=Registration failure: INSERT'); 
      } 
     } 
     header('Location: ./register_success.php'); 
    } 
} 
?> 

Answer 1

私は 'DBclass.php' が "$のmysqliの" 変数への代入が含まれていることを考えています。あたりです？現在のスクリプトでは、この変数への義務は含まれていないためです。 （したがって、それは決して初期化されていないのでnull値を含んでいます。）