Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/RowCellIterator.php
public function next()
    {
        do {
            ++$this->currentColumnIndex;
        } while (($this->onlyExistingCells) && (!$this->worksheet->cellExistsByColumnAndRow($this->currentColumnIndex, $this->rowIndex)) && ($this->currentColumnIndex <= $this->endColumnIndex));
    }
public function next()
    {
        do {
            ++$this->currentColumnIndex;
        } while (($this->onlyExistingCells) && (!$this->worksheet->cellExistsByColumnAndRow($this->currentColumnIndex, $this->rowIndex)) && ($this->currentColumnIndex <= $this->endColumnIndex));
    }
Set the iterator to its next value.