using static variable in different controller - php

Question

i'm making an application where i'm saving user information in user controller of my code igniter application inside a static variable, now i want to access static variable in other controller, how can i approach that? my code here
<?php
class User extends CI_Controller{
public static $user_data = array();
public __construct()
{
parent::__construct();
self::$user_data = array('value'); // values from the model
}
}
// now i can user that static variable from the view in this controller
class Friends extends CI_Controller{
public __construct()
{
parent::__construct();
if(User::$user_data->isFriends)
{
redirect('person/'.User::$user_data->id);
}
}
}
// how can i access this functionality in codeigniter? it gives error undefined class User not found

Answer 1

static::$user_data = array('value')
shouldn't it be self::... in your User class?

Answer 2

There are a number of issues with your code.
As you have defined that $user_data is an array with public static $user_data = array(); at the top of the User class, it is unnecessary to redefine it on line 7, i.e. self::$user_data = array('value');
Second issue is that the $user_data array will only contain one element, 'value'. I assume by lines 15 and 17 (User::$user_data->isFriends and User::$user_data->id), you are looking for two elements, 'isFriends' and 'id', these will not exist.
This brings me to another issue, the syntax you are using to get an element of the $user_data array will not work. The syntax '->' followed by a property name is used for variables of type Object, and cannot be used for an associative array.
Instead, you should use - for example - $user_data['isFriends'].
I have updated your code below...
<?php
class User extends CI_Controller{
public static $user_data = array();
public __construct()
{
parent::__construct();
// this does the same thing as self::$user_data = array('value');
// but without unnecessarily declaring the array again.
self::$user_data[] = 'value';
}
}
// now i can user that static variable from the view in this controller
class Friends extends CI_Controller{
public __construct()
{
parent::__construct();
if(User::$user_data['isFriends'])
{
redirect('person/'.User::$user_data['id']);
}
}
}
// how can i access this functionality in codeigniter? it gives error undefined class User not found
Try running the code and let me know what errors are being displayed and I will try and resolve them by updating my answer