PaginationCollection for Yii

<?php
use yii\data\Pagination;

/**
 * In base model class need to add method paginate
 *
 * public function paginate($perPage = 15, $page = null)
 * {
 *     return new PaginationCollection($this, $perPage, $page);
 * }
 */

class PaginationCollection implements \Iterator, \ArrayAccess
{
    /**
     * result rows
     *
     * @access protected
     * @var array
     */
    protected $result = [];

    /**
     * Per page results
     *
     * @access protected
     * @var int
     */
    protected $perPage = 15;

    /**
     * Current page
     *
     * @access protected
     * @var int
     */
    protected $page = 1;

    /**
     * Count results
     *
     * @access protected
     * @var int
     */
    protected $count = 0;

    /**
     * Pagination object
     *
     * @access protected
     * @var object
     */
    protected $pagination;

    /**
     * Constructor
     *
     * @access public
     * @param object $query
     * @param int $perPage
     * @param int $page
     */
    public function __construct($query, $perPage, $page)
    {
        $this->page = $this->getRequestPage($page);
        $this->perPage = (int) $perPage;
        $this->count = $query->count();
        $this->pagination = $this->createPagination();
        $this->result = $query
             ->offset($this->pagination->offset)
                 ->limit($this->pagination->limit)
                 ->all();
    }

    /**
     * Getter
     *
     * @access public
     * @param mixed $key
     * @return mixed
     */
    public function __get($key)
    {
        return isset($this->result[$key]) ? $this->result[$key] : null;
    }

    /**
     * Setter
     *
     * @access public
     * @param string $key
     * @param mixed $value
     */
    public function __set($key, $value)
    {
        $this->result[$key] = $value;
    }

    /**
     * Magic isset
     *
     * @access public
     * @param string $key
     * @return bool
     */
    public function __isset($key)
    {
        return isset($this->result[$key]);
    }

    /**
     * Magic unset
     *
     * @access public
     * @param string $key
     */
    public function __unset($key)
    {
        if ($this->__isset($key)) {
            unset($this->result[$key]);
        }
    }

    /**
     * Invoke method, get pagination
     *
     * @access public
     * @return object
     */
    public function __invoke()
    {
        return $this->getPagination();
    }

    /**
     * Get pagination object
     *
     * @access public
     * @return object
     */
    public function getPagination()
    {
        if (! $this->pagination) {
            $this->pagination = $this->createPagination();
        }
        return $this->pagination;
    }

    /**
     * Iterator rewind
     *
     * @access public
     * @return void
     */
    public function rewind()
    {
        reset($this->result);
    }

    /**
     * Iterator current element
     *
     * @access public
     * @return mixed
     */
    public function current()
    {
        return current($this->result);
    }

    /**
     * Iterator key
     *
     * @access public
     * @return string
     */
    public function key()
    {
        return key($this->result);
    }

    /**
     * Iterator next element
     *
     * @access public
     * @return mixed
     */
    public function next()
    {
        return next($this->result);
    }

    /**
     * Iterator valid
     *
     * @return bool
     */
    public function valid()
    {
        $key = key($this->result);
        return ($key !== NULL && $key !== FALSE);
    }

    /**
     * ArrayAccess exists
     *
     * @access public
     * @param string $key
     * @return bool
     */
    public function offsetExists($key)
    {
        return $this->__isset($key);
    }

    /**
     * ArrayAccess get element
     *
     * @access public
     * @param string $key
     * @return mixed
     */
    public function offsetGet($key)
    {
        return $this->__get($key);
    }

    /**
     * ArrayAccess set
     *
     * @access public
     * @param string $key
     * @param mixed $value
     */
    public function offsetSet($key, $value)
    {
        return $this->__set($key, $value);
    }

    /**
     * ArrayAcess unset
     *
     * @access public
     * @param string $key
     * @return void
     */
    public function offsetUnset($key)
    {
        return $this->__unset($key);
    }

    /**
     * Create pagination
     *
     * @access protected
     * @return object
     */
    protected function createPagination()
    {
        return new Pagination(['pageSize' => $this->perPage, 'page' => $this->page, 'totalCount' => $this->count]);
    }

    /**
     * Get request page
     *
     * @access protected
     * @param int $page
     * @return int
     */
    protected function getRequestPage($page)
    {
        if (! $page) {
             $page = (isset($_REQUEST['page'])) ? $_REQUEST['page'] : 1;
        }
        return (int) $page * 1;
    }
}