public function importExcel($function = null)
    {
        if ($this->upload_file()) {
            Price::deleteAll();
            if ($function) {
                $this->onImportRow = $function;
            }
            //$reader = \PHPExcel_IOFactory::createReader( /*$this->defaultFormat*/ );
            $objPHPExcel = \PHPExcel_IOFactory::load($this->_uploaded_file->tempName);
            $objWorksheet = $objPHPExcel->getActiveSheet();
            $highestRow = $objWorksheet->getHighestRow();
            $result = [];
            $foo = [];
            foreach ($objWorksheet->getRowIterator() as $i => $row) {
                $cellIterator = $row->getCellIterator();
                $cellIterator->setIterateOnlyExistingCells(false);
                $row = [];
                foreach ($cellIterator as $cell) $row[] = $cell->getValue();
                $foo = [$row[0] => $row[4]];
                if (!array_key_exists($row[0], $result)) {
                    $result = array_merge($result, $foo);
                }
            }
            foreach ($objWorksheet->getRowIterator() as $i => $row) {
                $cellIterator = $row->getCellIterator();
                $cellIterator->setIterateOnlyExistingCells(false);
                $row = [];
                foreach ($cellIterator as $cell) $row[] = $cell->getValue();
                \yii\helpers\VarDumper::dump($row, 9, 9);
                $this->_current_row = $i;
                if ($this->import_row([
                    'row' => $row,

                    'index' => $i,
                    'max_row' => $highestRow
                ])
                ) {
                } else {
                    break;
                }
            }
        }
    }