PHPOffice / PhpSpreadsheet

        $highestRow = $pSheet->getHighestRow();

        // 1. Clear column strips if we are removing columns

        if ($pNumCols < 0 && $beforeColumnIndex - 2 + $pNumCols > 0) {

            for ($i = 1; $i <= $highestRow - 1; ++$i) {

                for ($j = $beforeColumnIndex - 1 + $pNumCols; $j <= $beforeColumnIndex - 2; ++$j) {

                    $coordinate = Coordinate::stringFromColumnIndex($j + 1) . $i;

                    $pSheet->removeConditionalStyles($coordinate);

                    if ($pSheet->cellExists($coordinate)) {

                        $pSheet->getCell($coordinate)->setValueExplicit('', DataType::TYPE_NULL);

                        $pSheet->getCell($coordinate)->setXfIndex(0);

                    }

                }

            }

        }

        // 2. Clear row strips if we are removing rows

        if ($pNumRows < 0 && $beforeRow - 1 + $pNumRows > 0) {

        }

        // 2. Clear row strips if we are removing rows

        if ($pNumRows < 0 && $beforeRow - 1 + $pNumRows > 0) {

            for ($i = $beforeColumnIndex - 1; $i <= Coordinate::columnIndexFromString($highestColumn) - 1; ++$i) {

                for ($j = $beforeRow + $pNumRows; $j <= $beforeRow - 1; ++$j) {

                    $coordinate = Coordinate::stringFromColumnIndex($i + 1) . $j;

                    $pSheet->removeConditionalStyles($coordinate);

                    if ($pSheet->cellExists($coordinate)) {

                        $pSheet->getCell($coordinate)->setValueExplicit('', DataType::TYPE_NULL);

                        $pSheet->getCell($coordinate)->setXfIndex(0);

                    }

                }

            }

        }

        // Loop through cells, bottom-up, and change cell coordinate

        if ($remove) {