Config Static Variables Not Working

look this my config 

PHP Code:

<?php namespace Modules\Common\Config;

use CodeIgniter\Config\BaseConfig;

class ModuleCommonConfig extends BaseConfig
{
    /**
    * --------------------------------------------------------------------
    * Default Core Site Config
    * --------------------------------------------------------------------
    *
    */

    /*
    *---------------------------------------------------------------
    * public directory
    *---------------------------------------------------------------

    */
    public $publicDirectory = __DIR__ . '/../../../public';
    /*
        *---------------------------------------------------------------
        * public directory
        *---------------------------------------------------------------

        */
    public $uploadDirectory = __DIR__ . '/../../../public/upload';

    /*
          *---------------------------------------------------------------
          * public directory
          *---------------------------------------------------------------

          */

    public $folderDirectory = __DIR__ . '../../../';

}



call config like that 
$customConfig = new ModuleCommonConfig(); 


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