WordPress snippet to automatically change site tagline(blog description) once a day to a random item from an array. Relies on wp_schedule_event and WordPress action hooks.

change-tagline-daily.php

<?
// create new schedule_change action hook
add_action('schedule_change', 'change_description');

// function to schedule event if it doesn't exist
function activate_change() {
    // check if schedule_change action/event already exists
    if ( !wp_next_scheduled( 'schedule_change' ) ) {
        // schedule new event to trigger schedule_change daily
      wp_schedule_event( time(), 'daily', 'schedule_change');
	}
}

// call the change after global WP class object is set up
add_action('wp', 'activate_change');

// function to change the tagline/description
function change_description() {
    // array of descriptions, anything you want
    $description_list = array(
        "Something clever here.",
        "Nothing new under the sun.",
        "Everything you ever dreamed of."
    );
    // pick new description from array
    $new_description = $description_list[array_rand($description_list)];
    // update site tagline (blogdescription) in database
    update_option( 'blogdescription', $new_description);
}
?>

Good day, how exactly would I implement this into the latest WordPress release and get it to function correctly? Any assistance would be greatly appreciated.