How can PHP scripts be terminated gracefully to ensure internal shutdown functions are properly executed?

To ensure internal shutdown functions are properly executed in PHP scripts, you can register a shutdown function using the `register_shutdown_function()` function. This function allows you to specify a callback function that will be called when the script finishes execution, regardless of how it terminates. By using this function, you can ensure that any necessary cleanup or finalization tasks are performed before the script exits.

function graceful_shutdown() {
    // Perform any necessary cleanup tasks here
}

register_shutdown_function('graceful_shutdown');

// Your PHP script code here