What considerations should be taken into account when integrating external binaries like wkhtml2pdf with PHP on a Windows server?

When integrating external binaries like wkhtml2pdf with PHP on a Windows server, it is important to ensure that the binary file path is correctly specified, permissions are set appropriately, and any necessary environment variables are configured. Additionally, it is recommended to use the `exec()` function in PHP to execute the external binary.

// Specify the path to the wkhtml2pdf binary
$binary = 'C:/path/to/wkhtmltopdf.exe';

// Specify the input HTML file
$inputFile = 'input.html';

// Specify the output PDF file
$outputFile = 'output.pdf';

// Execute wkhtml2pdf command using exec()
exec("$binary $inputFile $outputFile");