static variable called in function giving error undefined codeigniter php

Question

I have defined static variable in controller but when I use that variable in functions it is giving undefined variable error.

Controller

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

class Quiz extends Admin_Controller {

    private static $secure_key = "aXXXXXXXXc";

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

    public function edit($id)
    {
        try
        {
            $token = JWT::encode($postdata, $secure_key);
            echo "<pre>";print_r($token);exit; 
        }
        catch(Exception $e){
            $this->data['error'] = $e->getMessage();
            redirect('/','refresh');
       }
    }
}

$token gets printed properly with jwt but I am getting an error

Undefined variable: secure_key

I tried different methods to define $secure_key as

public static $secure_key = "aXXXXXXXc;
static $secure_key = "aXXXXXXXc;

I tried to define $secure_key in constructor also as $secure_key = "aXXXXXXXc;

but no use. Why so? Please help. I am using codeigniter 3

$token = JWT::encode($postdata, $secure_key); ... $postdata appears to be undefined and $secure_key is a static class variable (so self::$secure_key) ? — CD001
– CD001, Commented Oct 18, 2017 at 9:51

Abdulla Nilam · Accepted Answer · 2017-10-18 09:50:34Z

4

Recommended Method (Based on Security)

Define variables in config.php and access it. This will work like Global Variable

$config['secure_key'] = 'myKey';
$this->config->item('secure_key'); # get
$this->config->set_item('secure_key', 'NewKey'); # set

Access it like this

$this->$secure_key

As per Comment by cd001

self::$secure_key

If function

$this->function_name();

edited Oct 18, 2017 at 9:50

answered Oct 18, 2017 at 9:44

Abdulla Nilam

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4 Comments

CD001 Over a year ago

$secure_key is static ... so self::$secure_key rather than $this->secure_key

RAUSHAN KUMAR Over a year ago

yeah any value which is used in the project globally, must be defined in config.php and should be loaded from config inside the code

Nagesh Katke Over a year ago

Thanks a lo it works. This means whenever I define static variable in codeigniter I need to write self::$secure_key or class_name::$variale_name to use it right.

Nagesh Katke Over a year ago

But @Abdulla if we define in config still we can change its value as given in answer as item and set_item. What if I dont want to change value of that variable, then static would be much prefarable?

Abdulla Nilam · Accepted Answer · 2017-10-18 09:59:39Z

3

Since $secure_key is declared as static inside your class. So it can be accessed using self or className as

self::$secure_key

or

Quiz::$secure_key

edited Oct 18, 2017 at 9:59

Abdulla Nilam

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answered Oct 18, 2017 at 9:52

RAUSHAN KUMAR

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