Use $this CI in codeigniter functions helper

CI Codeigniter Fatal error: Call to a member function userdata() on a non-object

Codeigniter provides in helper to defined $CI and used in functions helper, in some versions of codeigniter it cannot load on defined function in functions helper, in older versions it we just load in variable called $CI and used in functions helper $CI instead $this, that this we using in codeigniter model and controllers, here is I am sharing three types of solution to $CI.

first code this works fine in older versions of codeigniter.

Note: you must load related libraries and helpers if you didn’t auto loaded them from config folder autoloads.php

//GET INSTANCE
$CI = &get_instance();
$CI->load->database();
$CI->load->helper('url');

function get_userdata($sessionname){
	return $CI->session->userdata($sessionname);
}

In some of old versions of codeigniter above code cannot work

To fix this issue just make global variable of $CI in inside of function.

//GET INSTANCE
$CI = &get_instance();
$CI->load->database();
$CI->load->helper('url');

function get_userdata($sessionname){
	global $CI;
	return $CI->session->userdata($sessionname);
}

Newer Codeigniter versions like 2.2.0 they also thrown error even I globalize variable of $CI in inside of function.

CI Codeigniter Fatal error: Call to a member function userdata() on a non-object

I have also faced this issue and I fixed it like bellow code, I just create a function called ci_initialize

function ci_initialize(){
	$CI = &get_instance();
	$CI->load->database();
	return $CI->load->helper('url');
}

function get_userdata($sessionname){
	$CI = ci_initialize();
	return $CI->session->userdata($sessionname);
}