MY_Loader::_ci_init_library PHP Метод

    protected function _ci_init_library($class, $prefix, $config = FALSE, $object_name = NULL)
    {
        // Is there an associated config file for this class? Note: these should always be lowercase
        if ($config === NULL) {
            // Fetch the config paths containing any package paths
            $config_component = $this->_ci_get_component('config');
            if (is_array($config_component->_config_paths)) {
                $found = FALSE;
                foreach ($config_component->_config_paths as $path) {
                    // We test for both uppercase and lowercase, for servers that
                    // are case-sensitive with regard to file names. Load global first,
                    // override with environment next
                    if (file_exists($path . 'config/' . strtolower($class) . '.php')) {
                        include $path . 'config/' . strtolower($class) . '.php';
                        $found = TRUE;
                    } elseif (file_exists($path . 'config/' . ucfirst(strtolower($class)) . '.php')) {
                        include $path . 'config/' . ucfirst(strtolower($class)) . '.php';
                        $found = TRUE;
                    }
                    if (file_exists($path . 'config/' . ENVIRONMENT . '/' . strtolower($class) . '.php')) {
                        include $path . 'config/' . ENVIRONMENT . '/' . strtolower($class) . '.php';
                        $found = TRUE;
                    } elseif (file_exists($path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower($class)) . '.php')) {
                        include $path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower($class)) . '.php';
                        $found = TRUE;
                    }
                    // Break on the first found configuration, thus package
                    // files are not overridden by default paths
                    if ($found === TRUE) {
                        break;
                    }
                }
            }
        }
        $class_name = $prefix . $class;
        // Is the class name valid?
        if (!class_exists($class_name, FALSE)) {
            log_message('error', 'Non-existent class: ' . $class_name);
            show_error('Non-existent class: ' . $class_name);
        }
        // Set the variable name we will assign the class to
        // Was a custom class name supplied? If so we'll use it
        if (empty($object_name)) {
            $object_name = strtolower($class);
            if (isset($this->_ci_varmap[$object_name])) {
                $object_name = $this->_ci_varmap[$object_name];
            }
        }
        // Don't overwrite existing properties
        $CI = $this->get_instance();
        if (isset($CI->{$object_name})) {
            if ($CI->{$object_name} instanceof $class_name) {
                log_message('debug', $class_name . " has already been instantiated as '" . $object_name . "'. Second attempt aborted.");
                return;
            }
            show_error("Resource '" . $object_name . "' already exists and is not a " . $class_name . " instance.");
        }
        // Save the class name and object name
        $this->_ci_classes[$object_name] = $class;
        // Instantiate the class
        $CI->{$object_name} = isset($config) ? new $class_name($config) : new $class_name();
    }