从公共范围获取变量以连接数据库 [英] getting a variable from a public scope to connect database

问题描述

<?php  
$settings['hostname'] = '127.0.0.1';
$settings['username'] = 'root';
$settings['password'] = 'root';
$settings['database'] = 'band';
$settings['dbdriver'] = 'mysql';

/**
* DATABASE
*/
class database
{
 protected $settings;
 function __construct()
 {

 }

 function connect() 
    {
  $this->start = new PDO(
  $this->settings['dbdriver'] . ':host='. 
  $this->settings['hostname'] . ';dbname='. 
  $this->settings['database'],
  $this->settings['username'],
  $this->settings['password'],
  array(PDO::ATTR_PERSISTENT => true));

  $this->start->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING );
    }
}
?>

好的，我仍然是学生，所以今天我正在学习范围和连接数据库 问题是我如何将$ settings从类中放入受保护的$ settings中?

ok im still a student so today im learning about scope and connections database the question is how can i put the $settings out of the class in to the protected $settings in class ?

推荐答案

在显示的代码中您已经走在正确的道路上:根本不要使用公共(全局)范围-在OOP中，不认为这样做是一种好习惯依赖全局变量，因为它破坏了封装.而是在初始化对象时将设置注入到对象中.

You are already on the right path in the code you show: Don't use public (global) scope at all - it's not regarded good practice in OOP to rely on global variables, because it breaks encapsulation. Instead, inject the settings into the object when initializing it.

您可以添加一个构造函数来做到这一点:

You could add a constructor to do that:

function __construct($settings)
 {
   $this->settings = $settings;
 }

，然后像这样初始化类:

and then initialize the class like so:

 $database= new database($settings); 

或类似地，以防止带有敏感数据的变量浮动:

or like so, to prevent a variable with sensitive data floating around:

 $database= new database(array('hostname' => '127.0.0.1',
                  'username' => 'root',
                  'password' => 'root',
                  'database' => 'band',
                  'dbdriver' => 'mysql'));

作为旁注，在生产中使用时，为了安全起见，请考虑在连接后从阵列中删除password变量.没什么要紧，只是要做的一件好事.

As a side note, in production use, consider deleting the password variable from the array after connecting, for security. It's nothing essential but a nice additional thing to do.

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