Question

我使用MVC

编写登录系统脚本的tis代码

这是数据库类

<?php 



   class Database
   {

      private $host;
      private $user;
      private $password;
      private $database;


     function __construct($filename)
         {

            if (is_file($filename))include $filename;

                else throw new Exception("Error!");


            $this->host =$host;
            $this->user =$user;
            $this->password =$password;  
            $this->database =$database;

            $this->connect();

        }

    //Connect the server 

    private function connect()
       {
        $conn=mysqli_connect($this->host, $this->user, $this->password,       $this->database);

      //Check Connection
            if(!$conn)
                throw new Exception("Error: not connect to the server");




           // Select the database

       if(!mysqli_select_db($conn,$this->database))
           throw Exception("Error!");
     }


           //Close dataabase connection 

           function close()

            {
                    mysqli_close();    
            }    

     }




   ?>

当我调用此代码时

 <?php

    /*
    //Site login Controller 

    try      {    
         include './models/database.php';

          $vars= 'include/vars.php';


          new database($vars);


          }

           catch (Exception $exc)

            {
                 echo $exc->getMessage();
            }


            */



        /////////////////////login code start 

            if ($_POST)

           {
             if (isset($_POST['submit']) AND $_POST('submit') == "login" ) ; 
              {

               $data['email'] = $_POST['email'];
               $data1['password'] = $_POST['password'];

            try
                {
                    include './models/login.php';

                   $login = new login($data, $data1);

                    if($login == TRUE)
                    {   
                        session_start();
                        $_SESSION['loggedin']='12545526465'; 

                        header('Location:index.php');



                    }


                }
                catch (Eception $exc)
                { 
                    echo $exc->getMessage(); 
                }
                }

          }   




             ?>

它给了我这个

致命错误：无法声明类数据库，因为该名称已在第5行的................. \ database.php中使用

Answer 1

您不能在课程中包含相同文件的几次。您必须只包含一次。所以你改为include_once或更好的解决方案：在一些主文件中只包含一次该文件，并为所有应用程序仅创建一次db对象

致命错误：无法声明类Database，因为该名称已在使用中

1 个答案: