What role does PEAR play in simplifying complex file download processes in PHP?

When dealing with complex file download processes in PHP, it can be challenging to manage all the necessary components such as headers, content types, and file handling. PEAR (PHP Extension and Application Repository) provides a library called HTTP_Download that simplifies this process by abstracting away the complexities and allowing developers to easily handle file downloads with just a few lines of code.

<?php
require_once 'HTTP/Download.php';

$download = new HTTP_Download();
$download->setFile('/path/to/file.pdf');
$download->setContentDisposition(HTTP_DOWNLOAD_ATTACHMENT, 'file.pdf');
$download->send();