How can the pathinfo function in PHP be utilized to handle file extensions?

When handling file uploads or processing file paths in PHP, the pathinfo function can be used to extract information about the file, such as the file extension. This can be useful for validating file types or manipulating file paths based on their extensions. To handle file extensions using pathinfo, you can retrieve the extension using the 'PATHINFO_EXTENSION' flag in the function.

// Example of using pathinfo to handle file extensions
$filename = "example.txt";
$extension = pathinfo($filename, PATHINFO_EXTENSION);

echo "The file extension is: " . $extension;