What are some potential pitfalls when dynamically setting labels in Excel templates using PHP?

One potential pitfall when dynamically setting labels in Excel templates using PHP is not properly escaping special characters that may be present in the data. This can lead to formatting issues or even security vulnerabilities. To solve this, make sure to use a function like `htmlspecialchars()` to escape special characters before setting the label.

// Example of dynamically setting a label in an Excel template with proper escaping
$label = htmlspecialchars($data['label']);
$objPHPExcel->getActiveSheet()->setCellValue('A1', $label);