DirectoryItems Change

Fortunately, because the list of images in the DirectoryItems class is an array, you can use the ready-made PHP function to return a portion of an array—array_slice. All you need to do is wrap this function inside a method. Here is the additional method you require:

public function getFileArraySlice($start, $numberitems){
        return array_slice($this->filearray, $start, $numberitems);
}

The $start variable passed to this method performs the same function as the start variable in the Google query string discussed in Chapter 7. The $numberitems variable sets the number of items you wish to display per page. In a way, the entire PageNavigator class is an answer to the question, "How can you pass values to the getArraySlice method so that you can step through the list of images in an orderly fashion?"