$result = [];
            $foo = [];

            foreach ($objWorksheet->getRowIterator() as $i => $row) {
                $cellIterator = $row->getCellIterator();
                $cellIterator->setIterateOnlyExistingCells(false);
                $row = [];
                \yii\helpers\VarDumper::dump($cellIterator, 9, 9); die();
//                $cellIterator = array_reverse($cellIterator, true);
                foreach ($cellIterator as $cell) $row[] = $cell->getValue();
$foo = [$row[0] => $row[4]];
                $result = array_merge_recursive ($result, $foo);

            }