Pagerfanta defines Pagerfanta\Adapter\AdapterInterface which is the abstraction layer for any system to provide data to a Pagerfanta instance to support pagination lists.

The interface requires two methods to be implemented:

• getNbResults: Retrieves a count of the total number of items in the list
  • Generally, an adapter should return a result count of at least 0 as the count will come from either a database result or a count($foo) type of operation, however, an adapter can optionally validate the count and throw a Pagerfanta\Exception\NotValidResultCountException if the count is a negative number
• getSlice: Retrieves the list of items in the current page of the paginated list

<?php

namespace Pagerfanta\Adapter;

use Pagerfanta\Exception\NotValidResultCountException;

interface AdapterInterface
{
    /**
     * Returns the number of results for the list.
     * 
     * @throws NotValidResultCountException if the number of results is less than zero.
     */
    public function getNbResults(): int;

    /**
     * Returns an slice of the results representing the current page of items in the list.
     */
    public function getSlice(int $offset, int $length): iterable;
}