... of the DirectoryItems class and identifying it as private allows you to indicate that this behavior is internal and hidden rather than external and exposed.OOPHP_02.book Page 30 Friday, May ... this.When properly ordered and created, a directory and its subdirectories can function like a database and its tables; in fact, for some databases, a table is a directory and its contents. If ... DirectoryItems .php. We create the class instance with the code, $di =& new DirectoryItems('graphics');, where $di is the variable or instance of the object, and new both allocates memory and, ...