OOP PHP中的未定义变量

Question

我正在尝试过渡到 OOP PHP，以帮助清理我目前正在使用的代码集群。

我正在使用 PHPPass 在我的数据库中对密码进行哈希处理，但使用这种 OOP 方法，我无法理解如何在我的班级的登录函数中调用它。

据我所知，在我尝试调用它的所有地方，它总是在我的类初始化之前声明，但它仍然告诉我它是未定义的或非对象。

db_config.php

...
require_once("PasswordHash.php"); // Location no.1 to try it
$password_hash = new PasswordHash(8, FALSE);

include_once("DB.php");
$db = new DB($db_connection);

...

init.php

//require_once("PasswordHash.php"); // Location no.2 to try it
//$password_hash = new PasswordHash(8, FALSE);

require_once("db_config.php")

..Other init stuff..

DB.php

class DB {
   ... 
   public function login() {
      // global $password_hash; -> if uncommented I get an error saying it's a non-object

      // Error here 
      $password_accepted = $password_hash->CheckPassword($p, $hp);
   } 
   ...
}

登录.php

require_once("init.php");

$db->login();

我还没有完全理解类作用域在 PHP 中是如何工作的，所以我觉得我错过了一些东西。

Answer 1

您需要将哈希传递给该类，因为该类只有一个内部范围。

$formData = array();
$formData['email'] = 'user@email.com';

require_once("PasswordHash.php"); // Location no.1 to try it
$formData['password_hash'] = new PasswordHash(8, FALSE);

include_once("DB.php");
$db = new DB($db_connection, $formData);

在 DB.php 中：

class DB {
  // Stores the user input form data for use within the class?
  private $formData;
  // Runs when the class is constructed
  public function __construct($formData)
  {
    // When the class is constructed then store this for local/interal use
    $this->$formData = $formData;
  }
  public function login() {
    // The boolean result of of checking of an internal method
    // that compares user credentials against the database information?
    $password_accepted = $this->CheckPassword(
      $this->formData['email'], 
      $this->formData['password_hash']
    );
  }
  private function CheckPassword($email, $pass) {
    // Do query and bind in $user and $pass
    // Return true if everthing passes
  }
}

编辑：我夸大了将变量传递到类和方法中的用法，以帮助您了解这方面的问题，但您也可以执行以下操作：

    ...
    $password_accepted = $this->CheckPassword();
  }
  private function CheckPassword() {
    // Do query and bind in $this->formData['email'] and $this->formData['password_hash']
    // Return true if everthing passes
  }
}

Answer 2

只需 inject 哈希实例，就像您对 db_connection 所做的那样。

class DB {
    ...
    public function __construct($db_connection, $password_hash) {
        // you probably already have something like
        $this->connection = $db_connection;
        // now do the same for the hash object
        $this->pwhash = $password_hash;
    }

    public function login() {
    ...  
        $password_accepted = $this->pwhash->CheckPassword($p, $hp);
        ...
    }
}

（稍微偏离主题：数据库和哈希......以及密码、电子邮件和缓冲区这些是我最不喜欢初学者摆弄的课程）