How can PHP developers ensure that file downloads initiated by their scripts work seamlessly across different browsers, particularly in scenarios involving inline vs attachment content disposition?

When initiating file downloads in PHP scripts, developers can ensure seamless compatibility across different browsers by setting the appropriate headers for content disposition. To handle scenarios involving inline vs attachment disposition, developers can use the "Content-Disposition" header to specify whether the file should be displayed inline or downloaded as an attachment.

<?php
// Set the file path
$file = 'path/to/file.pdf';

// Set the appropriate headers for content disposition
header('Content-Type: application/pdf');
header('Content-Disposition: inline; filename="' . basename($file) . '"');
header('Content-Length: ' . filesize($file));

// Output the file
readfile($file);
?>