PHP在PDO聲明中崩潰準備

Question

我正在使用具有註冊/登錄功能的網站。我有一個註冊php文件，它只保存註冊表單併發布變量。然後我有一個連接到數據庫的函數文件（這是在一個外部文件中完成的，但我將它移動以使故障排除更簡單），一個驗證表單輸入的函數（所有內容都填充了，密碼相對安全），確保沒有當前用戶使用該用戶提供的電子郵件，然後嘗試註冊。註冊表單僅在後期運行signUpSubmit()功能。

問題是，當我嘗試準備一個語句時，它崩潰了。下面的代碼主要工作。如果我在表單中輸入無效數據（不要輸入相當安全的密碼，請不要填寫），它會引發錯誤。如果我用代碼運行它來檢查已經有這封電子郵件評論的用戶，它可以正常工作，只是將您帶回到註冊頁面。但是，如果我甚至取消註釋下面註釋代碼的第一行（$stmt = $db->prepare("SELECT * FROM用戶WHERE email = :email");），它只是加載一個空白頁面，就好像存在某種語法錯誤。它必須正確地連接到數據庫，就好像我搞砸了我的用戶名或密碼以進​​行連接，它會拋出一個錯誤，如果一切設置正確，沒有任何錯誤。我真的很困惑。

<?php 
//include_once 'db_connect.php'; 

session_start(); 

$DB_host = "localhost"; 
$DB_user = "root"; 
$DB_pass = "password"; 
$DB_name = "database"; 

try 
{ 
    $db = new PDO("mysql:host={$DB_host};dbname={$DB_name}",$DB_user,$DB_pass); 
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
} 
catch(PDOException $e) 
{ 
    echo $e->getMessage(); 
} 

function signUpSubmit() { // Validates inputs (makes sure they're all filled in, email has valid email, 
          // password has password that's relatively secure. Email and email 
          // confirmation and password and password confirmation match. Then 
          // checks if the user already exists. 
    if(empty($_POST['first_name'])) { 
     $firstNameError = "<span style='color: red'>*Please enter your first name.</span><br />"; 
    } 
    if(empty($_POST['last_name'])) { 
     $lastNameError = "<span style='color: red'>*Please enter your last name.</span><br />"; 
    } 
    if(empty($_POST['email'])) { 
     $emailError = "<span style='color: red'>*Please enter your email.</span><br />"; 
    } else if (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false) { 
     $emailError = "<span style='color: red'>*Email Address not valid.</span><br />"; 
    } 
    if(empty($_POST['email_confirm'])) { 
     $emailConfirmError = "<span style='color: red'>*Please confirm your email.</span><br />"; 
    } else if ($_POST['email'] != $_POST['email_confirm']) { 
     $emailConfirmError = "<span style='color: red'>*Email addresses do not match.</span><br />"; 
    } 
    if(empty($_POST['password'])) { 
     $passwordError = "<span style='color: red'>*Please enter your password.</span><br />"; 
    } else { // Validate password has one uppercase and one lowercase letter, 
       // 1 numer, at least 8 characters 
     $passwordError = "<span style='color: red'>*"; 

     if (strlen($_POST['password']) < 8) { 
      $passwordError = $passwordError . "Password must be at least 8 characters long. "; 
     } 
     if(!preg_match('/[a-z]/', $_POST['password'])){ 
      $passwordError = $passwordError . "Password must contain at least 1 lowercase letter. "; 
     } 
     if(!preg_match('/[A-Z]/', $_POST['password'])){ 
      $passwordError = $passwordError . "Password must contain at least 1 uppercase letter. "; 
     } 
     if(!preg_match('/[0-9]/', $_POST['password'])){ 
      $passwordError = $passwordError . "Password must contain at least 1 number. "; 
     } 

     $passwordError = $passwordError . "</span><br />"; 

     if($passwordError == "<span style='color: red'>*</span><br />") { 
      $passwordError = ""; 
     } 
    } 
    if(empty($_POST['password_confirm'])) { 
     $passwordConfirmError = "<span style='color: red'>*Please confirm your password.</span><br />"; 
    } else if($_POST['password'] != $_POST['password_confirm']) { 
     $passwordConfirmError = "<span style='color: red'>*Passwords do not match.</span><br />"; 
    } 

    // Add all the errors generated into an array to return 
    $errors = array($firstNameError, $lastNameError, $emailError, $emailConfirmError, $passwordError, $passwordConfirmError); 

    if(!array_filter($errors)) { // There were no errors, check if there is already 
            // a user with this email address 
     /*$stmt = $db->prepare("SELECT * FROM `users` WHERE email = :email"); 
     $stmt->bindParam(':email', $_POST['email']); 
     $stmt->execute(); 
     $row = $stmt->fetch(); 

     if($row['email'] == $_POST['email']) { // If a user with this email address exists, return an error 
      $emailError = "<span style='color: red'>*Email Address already taken. Please choose another.</span><br />"; 
      $errors = array($firstNameError, $lastNameError, $emailError, $emailConfirmError, $passwordError, $passwordConfirmError); 
     } else { // Register the user 
      if(register($_POST['first_name'], $_POST['last_name'], $_POST['email'], $_POST['password'])) { // Registration successful 
       redirect("index.php?signed-up=1"); 
      } else { // Registration failed 
       redirect("index.php?signed-up=0"); 
      } 
     }*/ 
    } else { 
     return $errors; // Return errors 
    } 
} 

function register($first_name, $last_name, $email, $password) 
{ 
    $new_password = password_hash($password, PASSWORD_DEFAULT); 

    $stmt = $db->prepare("INSERT INTO users(first_name, last_name, email, password) 
               VALUES(:first_name, :last_name, :email, :password)"); 

    $stmt->bindparam(":first_name", $first_name); 
    $stmt->bindparam(":last_name", $last_name); 
    $stmt->bindparam(":email", $email); 
    $stmt->bindparam(":password", $new_password);           

    if($stmt->execute()) { 
     return true; 
    } else { 
     return false; 
    } 
} 
?> 

Answer 1

你redirect()功能可能不存在，因此給你的問題。

我注意到的另一件事是你試圖從你的函數內部訪問$ db。由於範圍的差異，他們不會看到變量。這實際上可能是原因。