<?php
//Start Session
session_start();

//Include Configuration
require_once('config/config.php');

//Helper Function Files
require_once('helpers/system_helper.php');
require_once('helpers/format_helper.php');
require_once('helpers/db_helper.php');

//Autoload Classes
function __autoload($class_name){
require_once('libraries/'.$class_name . '.php');
}
?>

Warning: require_once(../../htdocs/PHP-Wizard/helpers/system_helper.php): failed to open stream: Permission denied in /opt/lampp/htdocs/PHP-Wizard/core/init.php on line 9

Fatal error: require_once(): Failed opening required '../../htdocs/PHP-Wizard/helpers/system_helper.php' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/PHP-Wizard/core/init.php on line 9

chmod -R 755 your_folder/

require_once('libraries/'.$class_name . '.php');

require_once 'classes/' . strtolower($class) . '.php';

(../../htdocs/PHP-Wizard/helpers/system_helper.php)