How can PHP be used to play music server-side on a Raspberry Pi?
To play music server-side on a Raspberry Pi using PHP, you can use the `exec()` function to run a command-line music player such as `mpg123`. This allows you to play music files directly from your PHP script.
<?php
$musicFile = "/path/to/your/music/file.mp3";
exec("mpg123 -q $musicFile");
?>