CI_Cache::__construct PHP Méthode

    public function __construct($config = array())
    {
        isset($config['adapter']) && ($this->_adapter = $config['adapter']);
        isset($config['backup']) && ($this->_backup_driver = $config['backup']);
        isset($config['key_prefix']) && ($this->key_prefix = $config['key_prefix']);
        // If the specified adapter isn't available, check the backup.
        if (!$this->is_supported($this->_adapter)) {
            if (!$this->is_supported($this->_backup_driver)) {
                // Backup isn't supported either. Default to 'Dummy' driver.
                log_message('error', 'Cache adapter "' . $this->_adapter . '" and backup "' . $this->_backup_driver . '" are both unavailable. Cache is now using "Dummy" adapter.');
                $this->_adapter = 'dummy';
            } else {
                // Backup is supported. Set it to primary.
                log_message('debug', 'Cache adapter "' . $this->_adapter . '" is unavailable. Falling back to "' . $this->_backup_driver . '" backup adapter.');
                $this->_adapter = $this->_backup_driver;
            }
        }
    }

 public function __construct()
 {
     parent::__construct(array('adapter' => 'apc'));
 }