Buscar un código de PHP

$helper = new PaginationHelper(['a','b','c','d','e','f'], 4);

$helper->pageCount(); // 2

$helper->itemCount(); // 6

$helper->pageItemCount(0); // 4

$helper->pageItemCount(1); // last page 2

$helper->pageItemCount(2); // -1 since the page is invalid

// pageIndex takes an item index and returns the page that it belongs on

$helper->pageIndex(5); // 1 (zero based index)

$helper->pageIndex(2); // 0

$helper->pageIndex(20); // -1

$helper->pageIndex(-10); // -1