PHPOffice / PhpSpreadsheet

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

                // Style

                $coordinate = Coordinate::stringFromColumnIndex($beforeColumnIndex - 1) . $i;

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

                    $xfIndex = $pSheet->getCell($coordinate)->getXfIndex();

                    $conditionalStyles = $pSheet->conditionalStylesExists($coordinate) ?

                        $pSheet->getConditionalStyles($coordinate) : false;

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

                        $pSheet->getCellByColumnAndRow($j, $i)->setXfIndex($xfIndex);

                        if ($conditionalStyles) {

                            $cloned = [];

                            foreach ($conditionalStyles as $conditionalStyle) {

                                $cloned[] = clone $conditionalStyle;

                            }

                            $pSheet->setConditionalStyles(Coordinate::stringFromColumnIndex($j) . $i, $cloned);

                        }

                    }

                }

            }

        }

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

                // Style

                $coordinate = Coordinate::stringFromColumnIndex($i) . ($beforeRow - 1);

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

                    $xfIndex = $pSheet->getCell($coordinate)->getXfIndex();

                    $conditionalStyles = $pSheet->conditionalStylesExists($coordinate) ?

                        $pSheet->getConditionalStyles($coordinate) : false;

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

                        $pSheet->getCell(Coordinate::stringFromColumnIndex($i) . $j)->setXfIndex($xfIndex);

                        if ($conditionalStyles) {

                            $cloned = [];

                            foreach ($conditionalStyles as $conditionalStyle) {

                                $cloned[] = clone $conditionalStyle;

                            }

                            $pSheet->setConditionalStyles(Coordinate::stringFromColumnIndex($i) . $j, $cloned);

                        }

                    }

                }

            }

        }