构造中的PHP未定义变量

Question

Here is my code:

<?php
require dirname(__DIR__).'/config/Redirect.php';

class Parsing {

    private $controller = null;
    private $model = null;
    private $parameters = array();

    private $redirect;

    public function __construct() {
        $this->redirect = new Redirect($controller, $model, $parameters); //error is on this line
    }

}
?>

The error I am getting is this (i removed the line number but I commented where the error is in the above code):

Notice: Undefined variable: controller in /var/www/html/application/config/Parsing.php on line #

Notice: Undefined variable: model in /var/www/html/application/config/Parsing.php on line #

Notice: Undefined variable: params in /var/www/html/application/config/Parsing.php on line #

it seems like controller is already defined right above it such as private $controller = null; and all the other ones. what could be the problem?

Answer 1

Change the line to:

$this->redirect = new Redirect($this->controller, $this->model, $this->parameters);