PHP 在 PDO 语句准备时崩溃

Question

我正在开发一个具有注册/登录功能的网站。我有一个注册 php 文件，它只保存注册表单并发布变量。然后我有一个连接到数据库的函数文件(这是在外部文件中完成的，但我移动它是为了使故障排除更简单)，一个验证表单输入的函数(所有内容都已填写，密码相对安全)，确保当前没有用户使用该用户提供的电子邮件，然后尝试注册。注册表单仅在发布时运行 signUpSubmit() 函数。

问题是当我尝试准备声明时它就崩溃了。下面的代码大部分有效。如果我在表单中输入无效数据(不要输入相当安全的密码，不要填写任何内容)，它会正常抛出错误。如果我使用代码运行它来检查已评论此电子邮件的用户，它工作正常，只需带您返回注册页面。但是，如果我取消注释下面注释代码的第一行 ($stmt = $db->prepare("SELECT * FROMusersWHERE email = :email");)，它只是加载一个空白页面，就好像存在某种语法错误一样。它必须正确连接到数据库，就好像我弄乱了连接的用户名或密码一样，它确实会抛出错误，如果一切设置正确，则不会出现错误。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

您的 redirect() 函数可能不存在，从而给您带来问题。

我注意到的另一件事是你试图从你的函数内部访问 $db 。由于范围差异，他们不会看到该变量。这实际上可能是原因。