yii\data\Pagination::getLinks PHP Method

    public function getLinks($absolute = false)
    {
        $currentPage = $this->getPage();
        $pageCount = $this->getPageCount();
        $links = [Link::REL_SELF => $this->createUrl($currentPage, null, $absolute)];
        if ($currentPage > 0) {
            $links[self::LINK_FIRST] = $this->createUrl(0, null, $absolute);
            $links[self::LINK_PREV] = $this->createUrl($currentPage - 1, null, $absolute);
        }
        if ($currentPage < $pageCount - 1) {
            $links[self::LINK_NEXT] = $this->createUrl($currentPage + 1, null, $absolute);
            $links[self::LINK_LAST] = $this->createUrl($pageCount - 1, null, $absolute);
        }
        return $links;
    }

 /**
  * Serializes a pagination into an array.
  * @param \yii\data\Pagination $pagination
  * @return array the array representation of the pagination
  * @see addPaginationHeaders()
  */
 protected function serializePagination($pagination)
 {
     if ($this->serializedPagination !== null) {
         return $this->serializedPagination;
     }
     /** @var \yii\rest\Serializer $serializer */
     $serializer = $this->serializer;
     return $this->serializedPagination = [$serializer->linksEnvelope => \yii\web\Link::serialize($pagination->getLinks(true)), $serializer->metaEnvelope => ['totalCount' => $pagination->totalCount, 'pageCount' => $pagination->getPageCount(), 'currentPage' => $pagination->getPage() + 1, 'perPage' => $pagination->getPageSize()]];
 }