/** * 加载精确的ua词典和字段匹配的ua词典 * @param string $extract_ualist * @param string $rough_ualist */ public static function getInstance($extract_ualist = '', $rough_ualist = '') { if (self::$_instance === null) { self::$_instance = new UserAgent($extract_ualist, $rough_ualist); } return self::$_instance; }