src/FelixOnline/Base/ResourceManager.php
private function isExternal($file)
    {
        if (strpos($file, 'http://') !== false
        || strpos($file, 'https://') !== false) {
            return true;
        } else {
            return false;
        }
    }
private function isExternal($file)
    {
        if (strpos($file, 'http://') !== false
        || strpos($file, 'https://') !== false) {
            return true;
        } else {
            return false;
        }
    }
/*
Check if file is external