PHP - 从静态方法调用实例方法

Question

I am having trouble calling a specific method from another class in my app. I have a class, Rest, that determines various settings, etc. about a particular request received by the server and creates a Rest object with the properties of the request. The Rest class may then call any given method in a separate class to fulfill the request. The problem is that the other class needs to call methods in the Rest class to send a response, etc.

How can this be possible? Here's a blueprint of my current setup:

class Rest {
    public $controller = null;
    public $method = null;
    public $accept = null;

    public function __construct() {
        // Determine the type of request, etc. and set properties
        $this->controller = "Users";
        $this->method = "index";
        $this->accept = "json";

        // Load the requested controller
        $obj = new $this->controller;
        call_user_func(array($obj, $this->method));
    }

    public function send_response($response) {
        if ( $this->accept == "json" ) {
            echo json_encode($response);
        }
    }
}

The controller class:

class Users {
    public static function index() {
        // Do stuff
        Rest::send_response($response_data);
    }
}

This results in receiving a fatal error in the send_response method: Using $this when not in object context

What's the better way to do this without sacrificing the current workflow.

Answer 1

You can create a Rest instance in User:

public static function index() {
    // Do stuff
    $rest = new Rest;
    $rest::send_response($response_data);
}

You could also change Rest to be a singleton and call an instance of it, but beware of this antipattern.