static variable called in function giving error undefined codeigniter php

php codeigniter codeigniter-3 static-variables

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

self::$secure_key

If function

$this->function_name();

php codeigniter codeigniter-3 static-variables

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

self::$secure_key

Quiz::$secure_key