<?php

public function login(){

        // If method was not POST goes to the login form
        if($_SERVER['REQUEST_METHOD'] == 'GET'){
              require_once('views/users/login.php');
            }
        else {
            // this try and catch does not work
            try{
                // if  username and password matched, it will return user_id
                $user_id = User::login();
                $user = User::find($user_id);

                $_SESSION['user_id']=$user->id;
                $_SESSION['username']=$user->username;
                $_SESSION['admin_level']=$user->admin_level;

                return call('user', 'show');
            }
            catch (Exception $ex){
                return call('pages','error');
            }
        }
    }