What are some best practices for converting Excel and Word documents to HTML using PHP?

When converting Excel and Word documents to HTML using PHP, it is important to maintain the formatting and structure of the original documents. One approach is to use PHP libraries such as PHPExcel for Excel documents and PHPWord for Word documents to read the contents and generate HTML output. These libraries provide methods to extract data and formatting information from the documents and convert them into HTML format.

// Example code for converting Excel document to HTML using PHPExcel library
require_once 'PHPExcel/Classes/PHPExcel.php';

$excelFile = 'example.xlsx';
$excelReader = PHPExcel_IOFactory::createReaderForFile($excelFile);
$excelObj = $excelReader->load($excelFile);

$writer = PHPExcel_IOFactory::createWriter($excelObj, 'HTML');
$writer->save('output.html');
```

```php
// Example code for converting Word document to HTML using PHPWord library
require_once 'PHPWord/PHPWord.php';

$wordFile = 'example.docx';
$phpWord = \PhpOffice\PhpWord\IOFactory::load($wordFile);

$htmlWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord, 'HTML');
$htmlWriter->save('output.html');