Setting a Config Item

With:

PHP Code:

$config['ion_auth'] ['identity'] = 'new_value'; 


I initialize $config array; but it isn't the same array where original configuration ion_auth was loaded...

If I try:

PHP Code:

var_dump($config); 


I have:

array(1) { ["ion_auth"]=> array(1) { ["identity"]=> string(9) "new_value" } }

If I try:

PHP Code:

var_dump($this->config); 


I see the original value, as loaded from file...

object(CI_Config)#3 (3) {

["config"]=> &array(...)
{
    ["ion_auth"]=> array(...)
        {  ["default_rounds"]=> int(8)
            ["identity"]=> string(5) "email"
            ["min_password_length"]=> int(8)
        }
}
}