找不到包含文件中的 Php 类

Question

我试图遵循这个 tutorial使用 MySql 为 Android 应用程序进行简单的登录和注册。 Android 应用程序运行良好，直到它在访问数据库(帐户注册)时遇到错误。

当我试图访问 php 应用程序以确保错误是在 Android 应用程序中时，我得到了这个错误:

Fatal error: Class 'DbConnect' not found in C:\xampp\htdocs\AndroidLogin\include\user.php on line 12

我确信 db.php 已经包含在 user.php 中。这些是我在教程中使用的代码: 第一个是 index.php

//index.php
<?php

require_once 'include/user.php';

$username = "";
$password = "";
$email = "";

if(isset($_POST['username'])){
    $username = $_POST['username'];
}

if(isset($_POST['password'])){
    $password = $_POST['password'];
}

if(isset($_POST['email'])){
    $email = $_POST['email'];
}

// Instance of a User class
$userObject = new User();

// Registration of new user
if(!empty($username) && !empty($password) && !empty($email)){
    $hashed_password = md5($password);
    $json_registration = $userObject->createNewRegisterUser($username, $hashed_password, $email);
    echo json_encode($json_registration);
}

// User Login
if(!empty($username) && !empty($password) && empty($email)){
    $hashed_password = md5($password);
    $json_array = $userObject->loginUsers($username, $hashed_password);
    echo json_encode($json_array);
}
?>

接下来，config.php

//config.php
<?php
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PASSWORD", "");
define("DB_NAME", "androidlogin");
?>

这个是db.php

// db.php
<?php

include_once 'config.php';

class DbConnect{
    private $connect;

    public function __construct(){
        $this->connect = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
        if (mysqli_connect_errno($this->connect)){
            echo "Failed to connect to MySQL: " . mysqli_connect_error();
        }
    }

    public function getDb(){
        return $this->connect;
    }
}
?>

最后一个是user.php

// user.php
<?php

include_once 'db.php';

class User{
    private $db;
    private $db_table = "users";

    public function __construct(){
        $this->db = new DbConnect();
    }

    public function isLoginExist($username, $password){
        $query = "select * from " . $this->db_table . " where username = '$username' AND password = '$password' Limit 1";
        $result = mysqli_query($this->db->getDb(), $query);

        if(mysqli_num_rows($result) > 0){
            mysqli_close($this->db->getDb());
            return true;
        }

        mysqli_close($this->db->getDb());
        return false;
    }

    public function createNewRegisterUser($username, $password, $email){
        $query = "insert into users (username, password, email, created_at, updated_at) values ('$username', '$password', '$email', NOW(), NOW())";
        $inserted = mysqli_query($this->db->getDb(), $query);

        if($inserted == 1){
            $json['success'] = 1;
        }else{
            $json['success'] = 0;
        }

        mysqli_close($this->db->getDb());

        return $json;
    }

    public function loginUsers($username, $password){
        $json = array();
        $canUserLogin = $this->isLoginExist($username, $password);

        if($canUserLogin){
            $json['success'] = 1;
        }else{
            $json['success'] = 0;
        }
        return $json;
    }
}
?>

我的目录是这样的:

AndroidLogin
|index.php
|include
 |config.php
 |db.php
 |user.php

我错过了什么吗？

Answer 1

通常，调用文件就像您在其中声明的类一样。在 WAMP 中通常会出现一些问题，我建议您在 DbConnect.php

中重命名 db.php