[WordPress] Mini plugin to display a random admin notice in the back-end. 📢 Use URL parameters to control count and type. Handy test tool for https://wordpress.org/plugins/wp-notification-center/

notifications-ffs.php

<?php
/**
 * Plugin Name:       Notifications FFS!
 * Description:       Gimme some dang old notifications to test that awesome <a href="https://wordpress.org/plugins/wp-notification-center/">WP Notification Center plugin</a>!
 * Version:           0.1
 * Author:            Caspar Hübinger
 * Author URI:        https://profiles.wordpress.org/glueckpress
 * License: GNU       General Public License v3
 * License URI:       http://www.gnu.org/licenses/gpl-3.0.html
 * Requires PHP:      5.3.0
 * Requires WP:       4.3
 */


if( ! defined( 'ABSPATH' ) )
	exit;


/**
 * Displays a random notification in the backend.
 * @return void
 */
function notifications_ffs() {
	add_action( 'admin_notices', function () {
		$hell_ya = (array) __gimme_notifications();
		printf( '<div class="%2$s notice"><p>%1$s</p></div>', $hell_ya[ 'msg' ], $hell_ya[ 'class' ] );
	} );
}
add_action( 'plugins_loaded', 'notifications_ffs' );


/**
 * Random notification message.
 * @return array Class name and text for message
 */
function __gimme_notifications() {
	$messages = array(
		array(
			'class' => 'notice-success',
			'msg'   => 'Heck, yeah! You’ve DONE it!!! It’s all good! Whatever it was, this little box here is telling you right now that you’ve succeeded. Congrats, sweetheart! You’ve earned yourself a treat. <a href="https://www.youtube.com/watch?v=vnDTSq3HmNo">Take it!</a>'
		),
		array(
			'class' => 'notice-error',
			'msg'   => 'BOOM, HA! Broken! Everything is! A bigass error has occurred, and here’s the freakin’ bill of service.<br /><br />Hm. Actually it can’t be that bad. This shit still works.<br />Whatever.'
		),
		array(
			'class' => 'notice-warning',
			'msg'   => 'You’ve been warned! Right now. Of whatever. Mermaids, maybe? Anyway, this is a warning, and you should be thoughtful now.'
		),
	);
	shuffle( $messages );
	$randomized = mt_rand( 0, count( $messages ) - 1 );

	return $messages[ $randomized ];
}