Paginator

This is yet another paginator for php. Main idea of this package is to build data source independent paginator, which has an ability to work in several modes:

• Count skip by id

      $loader = function (int $limit, int $skip): iterable
      {
          //SELECT * from users  WHERE id > $skip LIMIT $limit
      };
      
      $perPage = 100;
      $lastIdOnPreviousPage = 34;
      
      $paginatorFactory = new SkipById($perPage);
    
      $page = $paginatorFactory
          ->createPaginator(new CallableLoader($loader), $lastIdOnPreviousPage)
          ->paginate()
      ;

  In this example you have an ability use id as skip value. As you can see, Loader function accepts id in $skip variable. It should be id of last item on previous page and it comes from client side. For 1st page it should be 0. For $page->hasNext paginator will load $perPage + 1 item, and then check if actual count of loaded items is more than $perPage.

  Optionally, you can set $currentPage value, which will be set to $page->currentPage.

• Count skip by id with total count

     $loader = function (int $limit, int $skip): iterable {
         //SELECT * from users  WHERE id > $skip LIMIT
     };
    
     $counter = function (): int {
         //SELECT count(id) from users
     };
     
     $perPage = 100;
     $lastIdOnPreviousPage = 35;
     
     $paginatorFactory = new SkipByIdCountable($perPage);
     $page = $paginatorFactory
         ->createPaginator(
             new CallableLoader($loader),
             new CallableCounter($counter),
             $lastIdOnPreviousPage
         )
         ->paginate()
     ;

  In above example paginator counts skip by id and uses total count for $page->total, $page->totalPages values. For $page->hasNext paginator will load $perPage + 1 item, and then check if actual count of loaded items is more than $perPage.

• Count skip by id with total count and current page

     $loader = function (int $limit, int $skip): iterable {
         //SELECT * from users  WHERE id > $skip LIMIT
     };
    
     $counter = function (): int {
         //SELECT count(id) from users
     };
     
     $perPage = 100;
     $lastIdOnPreviousPage = 35;
     $currentPage = 4;
     
     $paginatorFactory = new SkipByIdCountable($perPage);
     $page = $paginatorFactory
         ->createPaginator(
             new CallableLoader($loader),
             new CallableCounter($counter),
             $lastIdOnPreviousPage,
             $currentPage
         )
         ->paginate()
     ;

  In above example paginator counts skip by id and uses total count for $page->total, $page->totalPages, $page->hasNext values. In this case, we know $currentPage value, which in real case comes from client, so we can use total count and $currentPage for counting $page->hasNext except using $perPage + 1 strategy.

• Count skip by offset

  $loader = function (int $limit, int $skip): iterable
  {
      //SELECT * from users LIMIT $limit OFFSET $skip
  };
  
  $perPage = 100;
  $currentPage = 2;
  
  $paginatorFactory = new SkipByOffset($perPage);
  
  $page = $paginatorFactory
      ->createPaginator(new CallableLoader($loader), $currentPage)
      ->paginate()
  ;

  In above example paginator counts skip as offset according to $perPage and $currentPage values. For counting $page->hasNext paginator will load $perPage + 1 item, and then check if actual count of loaded items is more than $perPage.

  • Count skip by offset and use total count

       $loader = function (int $limit, int $skip): iterable {
           //SELECT * from users LIMIT $limit OFFSET $skip
       };
      
       $counter = function (): int {
           //SELECT count(id) from users
       };
       
       $perPage = 100;
       $currentPage = 2;
       
       $paginatorFactory = new SkipByOffsetCountable($perPage);
    
       $page = $paginatorFactory
           ->createPaginator(new CallableLoader($loader), new CallableCounter($counter), $currentPage)
           ->paginate()
       ;

    In above example paginator counts skip by offset and uses total count for $page->total, $page->totalPages, $page->hasNext values.