在PHP中的扩展类中使用父变量 [英] Using parent variables in a extended class in PHP

问题描述

我有2个类，主和扩展。我需要在扩展类中使用main vars。

I have 2 classes, main and extended. I need to use main vars in extended class.

<?php
class Main {
  public $vars = array();
}

$main = new Main;

$main->vars['key'] = 'value';

class Extended extends Main { }

$other = new Extended;

var_dump($other->vars);

?>

我可以做什么？

例如：

<?php
class Extended extends Main {
  function __construct ($main) {
    foreach ($main as $k => $v) {
      $this->$k = $v;
    }
  }
}
?>

我需要一些解决方案更加透明和高效：）

I need some solution more transparent and efficient :)

推荐答案

EDIT ：使用控制反转（IoC） / em>（DI）。如果您使用自己的框架或没有依赖注入容器的框架，请尝试 League / Container

EDIT: This can be solved much better with Inversion of Control (IoC) and Dependency Injection (DI). If you use your own framework or one without Dependency Injection Container try League/Container

下面左侧为愚蠢答案的历史。

Answer below left as history of foolish answers.

正确的方式。

<?php
class Config {
    protected $_vars = array();

    protected static $_instance;

    private function __construct() {}

    public static function getInstance()
    {
        if (!isset(self::$_instance)) {
            self::$_instance = new self();
        }
        return self::$_instance;
    }

    public function &__get($name) {
        return $this->_vars[$name];
    }

    public function __set ($name, $value) {
        $this->_vars[$name] = $value;
    }
}

$config = Config::getInstance();
$config->db = array('localhost', 'root', '');
$config->templates = array(
    'main' => 'main',
    'news' => 'news_list'
);

class DB {
    public $db;

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

    public function connect()
    {
        mysql_connect($this->db[0], $this->db[1], $this->db[2]);
    }
}

$config = Config::getInstance();
$db = new DB($config->db);
$db->connect();

class Templates {
    public $templates;

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

    public function load ($where) {
        return $this->templates[$where];
    }
}

$config = Config::getInstance();
$templates = new Templates($config->templates);
echo $templates->load('main') . "\n";

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