我收到此错误：[2012年6月27日18:22:39 UTC]PHP致命错误：在/XXXX/public\\u html/wp-content/plugins/price-update/price-update中调用未定义的函数plugin\\u basename（）。php第68行：

            //We set the plugin basename here, could manually set it, but this is for demonstration purposes
            $this->plugin_basename = plugin_basename(__FILE__);

class PriceUpdate extends mtekk_admin
{
        protected $version = \'0.0.1\';
        protected $full_name = \'Price Update\';
        protected $short_name = \'Price Update\';
        protected $access_level = \'manage_options\';
        protected $identifier = \'pr_upate\';
        protected $unique_prefix = \'prud\';
        protected $plugin_basename = \'price-update/price-update.php\';
        protected $opt = array();
        /**
         * __construct()
         *
         * Class default constructor
         */
        function __construct()
        {
                //We set the plugin basename here, could manually set it, but this is for demonstration purposes
                $this->plugin_basename = plugin_basename(__FILE__);
                register_deactivation_hook(__FILE__, array($this, \'deactivate\'));
                add_action($this->unique_prefix . \'_cron_hook\', array($this,\'cron_handle\'));
                //Register some of our custom taxonomies
                add_action(\'init\', array($this, \'wp_init\'), 0);
                add_action(\'wp_footer\', array($this, \'footer\'));
                //We\'re going to make sure we load the parent\'s constructor
                parent::__construct();
        }

        protected $plugin_basename = \'price-update/price-update.php\';