MY_Loader::_ci_load_stock_library PHP Method

    protected function _ci_load_stock_library($library_name, $file_path, $params, $object_name)
    {
        $prefix = 'CI_';
        if (class_exists($prefix . $library_name, FALSE)) {
            if (class_exists(config_item('subclass_prefix') . $library_name, FALSE)) {
                $prefix = config_item('subclass_prefix');
            }
            // Before we deem this to be a duplicate request, let's see
            // if a custom object name is being supplied. If so, we'll
            // return a new instance of the object
            if ($object_name !== NULL) {
                $CI = $this->get_instance();
                if (!isset($CI->{$object_name})) {
                    return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
                }
            }
            log_message('debug', $library_name . ' class already loaded. Second attempt ignored.');
            return;
        }
        $paths = $this->_ci_library_paths;
        array_pop($paths);
        // BASEPATH
        array_pop($paths);
        // APPPATH (needs to be the first path checked)
        array_unshift($paths, APPPATH);
        foreach ($paths as $path) {
            if (file_exists($path = $path . 'libraries/' . $file_path . $library_name . '.php')) {
                // Override
                include_once $path;
                if (class_exists($prefix . $library_name, FALSE)) {
                    return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
                } else {
                    log_message('debug', $path . ' exists, but does not declare ' . $prefix . $library_name);
                }
            }
        }
        include_once BASEPATH . 'libraries/' . $file_path . $library_name . '.php';
        // Check for extensions
        $subclass = config_item('subclass_prefix') . $library_name;
        foreach ($paths as $path) {
            if (file_exists($path = $path . 'libraries/' . $file_path . $subclass . '.php')) {
                include_once $path;
                if (class_exists($subclass, FALSE)) {
                    $prefix = config_item('subclass_prefix');
                    break;
                } else {
                    log_message('debug', $path . ' exists, but does not declare ' . $subclass);
                }
            }
        }
        return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
    }