Code Igniter未在控制器中运行该方法

I have a form in a view called login_view that I would like to target a function in the Login controller.

For my form in login_view I have echo form_open('/Login/validate_credentials');

In my Login.php controller I have:

<?php if (! defined('BASEPATH')) exit('No direct script access allowed');

class Login extends CI_Controller{

    function __construct()
    {
        parent::__construct();
    }

    public function validate_credentials(){
        $this->load->view('welcome2');
    }
}
?>  

When I submit the form from the browser, instead of loading the welcome2 view like I expect, it tries to load the URL of:

localhost/project/Login/validate_credentials

and I just see the default page for WAMP.

It's my first day in Code Igniter so I'm sure the answer is simple.

Just replace your controller construct by this:

 public function __construct()
 {
    parent::__construct();
    $this->load->helper(array('url','text','html','form','string'));
}