How can I pass variable between controller functions - php

Question

This is my first time doing web programming. I want to make one variable that I can use on some functions, I use public $username; and public $password; and use $this->username and $this->password; but it didn't work. This is my code on controller;
public $can_log ;
public function home(){
$this->load->model("model_get");
$data["results"] = $can_log;
$this->load->view("content_home",$data);
}
public function login(){
$this->load->view("site_header");
$this->load->view("content_login");
$this->load->view("site_footer");
}
public function login_validation(){
$this->load->library('form_validation');
$this->load->view("site_header");
$this->load->view("site_nav");
$this->form_validation->set_rules('username','Username','required|trim|callback_validate_credentials');
$this->form_validation->set_rules('password','Password','required|trim');// use md5 if want to encrpyt this
if($this->form_validation->run()){
redirect('site/home');
} else {
$this->load->view('content_login');
}
}
public function validate_credentials(){
$this->load->model('model_get');
$username = $this->input->post('username');//"user";
$password = $this->input->post('password');//"password";
//I tried both but none of those work
$this->can_log = $this->model_get->can_log_in($username, $password);
if($this->can_log){
return true;
} else {
$this->form_validation->set_message('validate_credentials','Incorrect username/password.');
return false;
}
}
I also tried with public $username and public $password but still can't get it
on my model;
public function can_log_in($username, $password){
$query = $this->db->query("SELECT col1, col2 FROM table1 where id_login = '$username' and id_password = '$password'");
if($query->num_rows() > 0) {
$data = $query->result(); // fetches single row: $query->row();
return $data; //fetches single column: $data->col1;
}
}
so how can I get can_log - that contains col1 and col2 - to other function?

Answer 1

Maybe something like this?
public function with_parameter($parameter)
{
do something with $parameter
}
And then call the function
with_parameter($can_log);

Answer 2

I didn't understood the exact requirements, but try below code if it works for you.
Have followed some CI guidelines which you need to learn.
Controller:
class Controller_name extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model("model_get"); // load models in constructor
$this->can_log = "some value"; // is the way to define a variable
}
public function home()
{
$data["results"] = $this->can_log; // is the way to retrieve value
$this->load->view("content_home",$data);
}
public function validate_credentials()
{
$username = $this->input->post('username');
$password = $this->input->post('password');
$is_valid = $this->model_get->can_log_in($username, $password);
if($is_valid)
{
return true;
}
else
{
$this->form_validation->set_message('validate_credentials','Incorrect username/password.');
return false;
}
}
}
Model:
class Model_get extends CI_Model
{
public function can_log_in($username, $password)
{
$where_aray = array("id_login" => $username, "id_password" => $password);
$query = $this->db->get_where("table", $where_array);
if($query->num_rows() > 0)
return $query->row();
return false;
}
}