How can the use of DIRECTORY_SEPARATOR system constant improve platform compatibility in PHP file path manipulation?

When working with file paths in PHP, using the DIRECTORY_SEPARATOR system constant can improve platform compatibility by automatically using the correct directory separator for the current operating system. This ensures that your file paths will work correctly regardless of whether you are running your code on a Windows, Unix, or macOS system.

// Using DIRECTORY_SEPARATOR to improve platform compatibility in file path manipulation
$filePath = 'path' . DIRECTORY_SEPARATOR . 'to' . DIRECTORY_SEPARATOR . 'file.txt';