MVC php 中的数据库连接出错接收 500 内部服务器错误，如何修复 mysql 调用数据库？ [关闭]

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每次尝试将代码放在实时服务器上以连接到数据库时，我都会收到错误消息。 这适用于本地主机服务器，但是当我尝试通过实时服务器运行它时，由于某种原因它无法正常工作，我不知道如何解决它。 我已经通过测试 function 测试了 model 中的功能工作，但是当我查询 MySQL 语句时，即出现错误。

这是数据库的代码；

<?php
  /*
   * PDO Database Class
   * Connect to database
   * Create prepared statements
   * Bind values
   * Return rows and results
   */
  class Database {


    
    private $host = DB_HOST;
    private $user = DB_USER;
    private $pass = DB_PASS;
    private $dbname = DB_NAME;

    private $dbh;
    private $stmt;
    private $error;

    

    public function __construct(){
      // Set DSN
      $dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
      $options = array (
        PDO::ATTR_PERSISTENT => true,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION 
      );

      // Create a new PDO instanace
      try {
        $this->dbh = new PDO ($dsn, $this->user, $this->pass, $options);
      }     // Catch any errors
      catch ( PDOException $e ) {
        $this->error = $e->getMessage();
      }
    }

    // Prepare statement with query
    public function query($sql){
      $this->stmt = $this->dbh->prepare($sql);
    }

    // Bind values
    public function bind($param, $value, $type = null){
      if(is_null($type)){
        switch(true){
          case is_int($value):
            $type = PDO::PARAM_INT;
            break;
          case is_bool($value):
            $type = PDO::PARAM_BOOL;
            break;
          case is_null($value):
            $type = PDO::PARAM_NULL;
            break;
          default:
            $type = PDO::PARAM_STR;
        }
      }

      $this->stmt->bindValue($param, $value, $type);
    }

    // Execute the prepared statement
    public function execute(){
      return $this->stmt->execute();
    }

    // Get result set as array of objects
    public function resultSet(){
      $this->execute();
      return $this->stmt->fetchAll(PDO::FETCH_OBJ);
    }

    // Get single record as object
    public function single(){
      $this->execute();
      return $this->stmt->fetch(PDO::FETCH_OBJ);
    }

    // Get row count
    public function rowCount(){
      return $this->stmt->rowCount();
    }

    /*public static function clean_string($data) {
      return self::$database->escape_string(filter_var($data, FILTER_SANITIZE_STRING));
    }

    public static function get($what, $from, Array $conditions = [], $order = false, $clean = true) {
      $what = ($what == '*') ? "*" : '`' . implode('`, `', $what) . '`';
      $from = '`' . $from . '`';
      $where = [];

      foreach($conditions as $key => $value) {
        $value = ($clean) ? self::clean_string($value) : $value;
        $where[] = '`' . $key . '` = \'' . $value . '\'';
      }
      $where = implode(' AND ', $where);

        $order_by = ($order) ? 'ORDER BY ' . $order : null;

        $result = query("SELECT {$what} FROM {$from} WHERE {$where} {$order_by}");

        return ($result->num_rows) ? $result->fetch_object() : false;
    }*/
  } 

这是登录controller；

  

  class Login extends Controller {
    public function __construct(){
      $this->userModel = $this->model('User');
        
      /*if($this->userModel->checkLogin()) {
        header('Location:' . URLROOT . "/dashboard");
      }*/

    }
    

    public function index(){

      $data = [
          'Sitename' => 'Login',
          'url' => $_GET,
          'error' => []
          ];

      if(isset($_POST['email']) && isset($_POST['password'])) {
        //check to see if the credd

        $email = trim($_POST['email']); //Taking away white space 
        $password = trim($_POST['password']);

        $sani_email = filter_var($email, FILTER_SANITIZE_EMAIL);

        if(!filter_var($email, FILTER_VALIDATE_EMAIL)) {
          array_push($data['error'], "Email isn't valid.");
        } else {

          if($this->userModel->checkEmailExists($sani_email)) { // checking if email is in db

            if($this->userModel->login($sani_email, $password)) { //Checking if the password matchs the database with the email
              header("Location: " . URLROOT . "/dashboard");
            } else {
              array_push($data['error'], "Password does not match with the email.");
              print_r($data['error']);
            }

          } else {
            array_push($data['error'], "Email doesn't exist.");
            print_r($data['error']);
          }
        }


      }


        

      $this->view('login/index', $data);
    }

    
  } ```

This is the  model for the user;
``` <?php
  class User {
    private $db;


    public function __construct(){
      $this->db = new Database;
    }
public function login($email, $password) {
      //Login user 

      $error = [];

      //Clean usser input
      $email      = strip_tags(trim($email));
      $password   = strip_tags(trim($password));

      if(empty($email) || empty($password)) {
        //Empty Fields
        exit();
      } else {
 
        //validate email
        if(!filter_var($email, FILTER_VALIDATE_EMAIL)) {
          $error['email'] = "Email is not valid.";
        }
        

        //Validate user input
        $saniEmail    = filter_var($email, FILTER_SANITIZE_EMAIL);
        $saniPassword = filter_var($password, FILTER_SANITIZE_STRING);

        if (filter_var($saniEmail, FILTER_VALIDATE_EMAIL)) {
          //this sanitized email is considered valid
        }

        if(!$this->checkEmailExists($saniEmail)) {
          $error['email'] = "Email doesn't exist.";
        }

        if(sizeof($error) < 1) {

          $this->db->query('SELECT email, password FROM users WHERE email = :email');

          $this->db->bind(':email', $email);

          $user = $this->db->single();

          if($user->email == $email && $this->checkPassword($password, $user->password)) {
            //Credentials are correct

            $this->createSession($user->email);
            //redircet to dashboard
            return true;
          } else {
            //Return an array with errors to display them
            return $error;
          }

          
        }
        

      }

    }



    public function checkEmailExists($email) {
      //Checking to see if email exists
      //Query to database to see if an user has used this email or not
      $this->db->query('SELECT email FROM users WHERE email = :email');

      //Bind values
      $this->db->bind(':email', $email);

      $this->db->execute();

      if($this->db->rowCount() > 0) {
        //email is taken
        return true;
      } else {
        return false;
      }
    } // End of checkEmailExists
}

这一切都适用于我与 xampp 一起使用的本地主机。