在 class 中找不到方法

Question

我正在开发一个登录功能，但出现了一个我无法弄清楚的错误。

这是我的模特登录class:

class Login {

    private $username;
    private $password;
    private $cxn;       //database object

    function __construct($username,$password)
    {
        //set data
        $this->setData($username, $password);
        //connect DB
        $this->connectToDB();
        // get Data 
    }

    function setData($username, $password)
    {
        $this->username = $username;
        $this->password = $password;
    }

    private function connectToDB()
    {
        include 'Database.php';
        $connect = '../include/connect.php';
        $this->cxn = new database($connect);  
    }

    function getData()
    {
        $query = "SELECT * FROM anvandare WHERE anvandarnamn = '$this->username' AND losenord ='$this->'password'";
        $sql = mysql_query($query);

        if(mysql_num_rows($sql)>0)
        {
            return true;
        }
        else
        {
            throw new Exception("Användarnamnet eller Lösenordet är fel. Försök igen.");
        } 
    }

    function close() 
    {
        $this->cxn->close(); //Here is the error it says "Method 'close' not found in class
    }
}

最后一个函数给出错误“在class中找不到方法'close'”，“在主题中找不到引用的方法class."

这是我的数据库 class:

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();
    }

    private function connect()
    {
        //Connect to the server
        if(!mysql_connect($this->host, $this->user, $this->password))
        throw new exception("Error, not connected to the server.");

        //Select the database
        if(!mysql_select_db($this->database))
        throw new exception("Error, no database selected");             
    }

    function close()
    {
        mysql_close();
    }
}

路径是正确的，所以不是。可能是什么错误？

Answer 1

您可以尝试 function __destruct() {} Reference

而不是 close() 函数

问题在于缺少public/protected/private

Answer 2

您必须在数据库中的方法声明中添加 "public" 关键字 class 恕我直言

public function close()

Answer 3

我不认为代码中存在可见性问题。 PHP 手册指出：

Class methods may be defined as public, private, or protected. Methods declared without any explicit visibility keyword are defined as public.

我认为您可能有两个数据库类。本主题中描述了类似的问题： best way to call function from an extended class

Answer 4

PhpStorm 无法确定您的 $this->cxn 字段是什么类型。您可以通过简单的 PHPDoc 注释提供类型提示来提供帮助：

/** @var Database */
private $cxn;       //database object

Answer 5

这个提示也有助于 PHPstorm 正确识别方法

如果您有这样的代码：

foreach( $myEntity as $entity ) {  
  $entity->myValidMethod();
}

只需添加此提示：

/* @var $entity \My\Name\Space\Path\MyEntity */
foreach( $myEntity as $entity ) {  
  $entity->myValidMethod();
}

感谢http://mossco.co.uk/symfony-2/how-to-fix-method-not-found-in-class-orange-warning-in-phpstorm/

在 class 中找不到方法

Method not found in class

php

mysql

phpstorm