php - PHPExcel read empty cells -

i'm using phpexcel library data cells. implemented phpexcel_reader_ireadfilter iterface , set in reader object read data custom range(b1:j50 e.g). works fine reader doesn't empty cells, need them. call iterateonlyexistingcells(false), reader ignoring filter , cells.

class cellsfilter implements phpexcel_reader_ireadfilter {         private $startcellname;         private $startcellvalue;         private $endcellname;         private $endcellvalue;         private $additionalcells;           public function __construct($strrange)  {             $this->initializerange($strrange);                   }          public function readcell($column, $row, $worksheetname = '') {              if ($row >= $this->startcellvalue && $row <= $this->endcellvalue) {                 if (in_array($column, range($this->startcellname, $this->endcellname))) {                                        return true;                 }             }             return false;         }