全局变量未在PHP Codeigniter中更新

Question

I want to update a global variable in my MVC application. I'm passing information via my global variable $foo but for some reason it is not updating the data in one of my functions in the class

How can I update the value of $foo inside my function?

My code:

class example extends CI_Controller {

    private $foo;

    public function __construct() {
        parent::__construct();
        $this->foo = 10;
    }

    public function index() {
        // some code here
        $this->foo = 20;
        $data['main_content'] = 'login_form';
        $this->load->view('includes/template', $data);
    }

    if($this->input->post()) {
       error_log($this->foo);
    }
} 

It is returning 10 even though I am trying to update the value to 20

Answer 1

I'm not sure what you are doing here... but this works.

class Main extends CI_Controller {

    private $foo;

    public function __construct() {
        parent::__construct();
        $this->foo = 10;
    }

    public function index() {
        // some code here
        $this->foo = 20;
        echo $this->foo; // The result is 20 as set.
    }
    // hard coded the setter var name for demonstration purposes only
    public function set_foo($foo){
       $this->foo = $foo;
    }
    // hard coded the getter var name for demonstration purposes only
    public function get_foo(){
       return $this->foo;
    }

}

$foo is a "property" of the class which IS accessible to all of it's member "methods". It isn't a GLOBAL as you refer to it. GLOBALS are accessible to everything.