My very first example of rich text
generated from html markup
This block contains an italicized word;
while this block uses an underline.
I want to eat healthy food pizza.
';
$html2 = '
    100°C is a hot temperature
    10°F is cold
';
$html3 = '23 equals 8';
$html4 = 'H2SO4 is the chemical formula for Sulphuric acid';
$html5 = 'bold, italic, bold+italic';
$wizard = new HtmlHelper();
$richText = $wizard->toRichTextObject($html1);
$spreadsheet->getActiveSheet()
    ->setCellValue('A1', $richText);
$spreadsheet->getActiveSheet()
    ->getColumnDimension('A')
    ->setWidth(48);
$spreadsheet->getActiveSheet()
    ->getRowDimension(1)
    ->setRowHeight(-1);
$spreadsheet->getActiveSheet()->getStyle('A1')
    ->getAlignment()
    ->setWrapText(true);
$richText = $wizard->toRichTextObject($html2);
$spreadsheet->getActiveSheet()
    ->setCellValue('A2', $richText);
$spreadsheet->getActiveSheet()
    ->getRowDimension(1)
    ->setRowHeight(-1);
$spreadsheet->getActiveSheet()
    ->getStyle('A2')
    ->getAlignment()
    ->setWrapText(true);
$spreadsheet->setActiveSheetIndex(0)
    ->setCellValue('A3', $wizard->toRichTextObject($html3));
$spreadsheet->setActiveSheetIndex(0)
    ->setCellValue('A4', $wizard->toRichTextObject($html4));
$spreadsheet->setActiveSheetIndex(0)
    ->setCellValue('A5', $wizard->toRichTextObject($html5));
// Rename worksheet
$helper->log('Rename worksheet');
$spreadsheet->getActiveSheet()
    ->setTitle('Rich Text Examples');
// Save
$helper->write($spreadsheet, __FILE__);