Answer to question http://www.question2answer.org/qa/40528/to-display-on-site-notifications-plugin-somewhere-else

q2apro-onsitenotifications-layer.php

<?php
/*
	Plugin Name: On-Site-Notifications
	Plugin URI: http://www.q2apro.com/plugins/on-site-notifications
	Plugin Description: Facebook-like / Stackoverflow-like notifications on your question2answer forum that can replace all email-notifications.
	Plugin Version: 1.0
	Plugin Date: 2014-03-29
	Plugin Author: q2apro.com
	Plugin Author URI: http://www.q2apro.com/
	Plugin License: GPLv3
	Plugin Minimum Question2Answer Version: 1.5
	Plugin Update Check URI: https://raw.githubusercontent.com/q2apro/q2apro-on-site-notifications/master/qa-plugin.php
	
	This program is free software. You can redistribute and modify it 
	under the terms of the GNU General Public License.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.gnu.org/licenses/gpl.html

*/

	class qa_html_theme_layer extends qa_html_theme_base {
		
		private $eventcount;

		function head_script(){
			qa_html_theme_base::head_script();
			if(qa_opt('q2apro_onsitenotifications_enabled')) {
				$this->output('<script type="text/javascript">
						var eventnotifyAjaxURL = "'.qa_path('eventnotify').'";
					</script>');  
				$this->output('<script type="text/javascript" src="'.QA_HTML_THEME_LAYER_URLTOROOT.'script.js"></script>');
				$this->output('<link rel="stylesheet" type="text/css" href="'.QA_HTML_THEME_LAYER_URLTOROOT.'styles.css">');
			}
		}
		
		function doctype() {
			/* The following code originates from q2a plugin "History" by NoahY and has been modified by q2apro.com
			 * It is licensed under GPLv3 http://www.gnu.org/licenses/gpl.html
			 * Link to plugin: https://github.com/NoahY/q2a-history
			 */
			if(qa_opt('q2apro_onsitenotifications_enabled') && qa_get_logged_in_userid()) {

				qa_db_query_sub(
					'CREATE TABLE IF NOT EXISTS ^usermeta (
					meta_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
					user_id bigint(20) unsigned NOT NULL,
					meta_key varchar(255) DEFAULT NULL,
					meta_value longtext,
					PRIMARY KEY (meta_id),
					UNIQUE (user_id,meta_key)
					) ENGINE=MyISAM  DEFAULT CHARSET=utf8'
				);		

				$last_visit = qa_db_read_one_value(
					qa_db_query_sub(
						'SELECT UNIX_TIMESTAMP(meta_value) FROM ^usermeta WHERE user_id=# AND meta_key=$',
						qa_get_logged_in_userid(), 'visited_profile'
					),
					true
				);

				// first time visitor, we set the last visit manually in the past
				if(is_null($last_visit)) {
					$last_visit = '1981-03-31 06:25:00';
				}
				// select and count all in_eventcount that are newer as last visit
				$this->eventcount = qa_db_read_one_value(
					qa_db_query_sub(
						'SELECT COUNT(event) FROM ^eventlog 
								WHERE userid=# AND DATE_SUB(CURDATE(),INTERVAL # DAY) <= datetime 
								AND FROM_UNIXTIME(#) <= datetime 
								AND event LIKE "in_%"',
								qa_get_logged_in_userid(), 
								qa_opt('q2apro_onsitenotifications_maxage'), 
								$last_visit
					)
				);
			}
			qa_html_theme_base::doctype();
		}

		public function nav_user_search() {
			qa_html_theme_base::nav_user_search();
			if ($this->eventcount > 0) {
				if ($this->eventcount == 1) {  // only one event
					$tooltip = qa_lang('q2apro_onsitenotifications_lang/one_notification');
				} else {
					$tooltip = $this->eventcount.' '.qa_lang('q2apro_onsitenotifications_lang/x_notifications');
				}
				$classSuffix = 'new';  // add notify bubble to user navigation highlighted
			} else {
				$tooltip = qa_lang('q2apro_onsitenotifications_lang/show_notifications');
				$this->eventcount = qa_opt('q2apro_onsitenotifications_nill');
				$classSuffix = 'nill';  // add notify bubble to user navigation
			}
			$this->output(sprintf(
				'<a class="qa-history-new-event-link" title="%s" style="float: right; margin-right: 5px">' .
					'<span class="notifybub ntfy-event-%s">%s</span>' .
				'</a>',
				$tooltip, $classSuffix, $this->eventcount
			));
		}

	} // end qa_html_theme_layer
	

/*
	Omit PHP closing tag to help avoid accidental output
*/