在引导程序中设置静态方法的默认值

SearchIndexer::setIndexDirectory(ROOT_DIR . \'/var/search_index\');
Places_Db_Table_Row_Observable::attachObserver(\'SearchIndexer\');

An error occurred exception \'Zend_Search_Exception\' with message \'No index directory specified\' in E:\\xampp\\php\\PEAR\\Zend\\Search\\Lucene.php:497

SearchIndexer::setIndexDirectory(ROOT_DIR.\'/var/search_index\');  
Places_Db_Table_Row_Observable::attachObserver(\'SearchIndexer\'); 

$index = Places_Search_Lucene::open(SearchIndexer::getIndexDirectory());

public static function setIndexDirectory($directory){
    if(!is_dir($directory)) {
        throw new Exception(\'Directory for SearchIndexer is invalid (\'. $directory .\')\');
    }
    self::$_indexDirectory = $directory;
}

public static function getIndexDirectory(){
    return self::$_indexDirectory;
}