Custom #_EVENTTICKETS placeholder

add_filter('em_event_output_placeholder','my_em_placeholder_available_spaces',100,3);
function my_em_placeholder_available_spaces($replace, $EM_Event, $result){
	if ( $result == '#_EVENTTICKETS' ) {
		$replace = "<ul>";
		foreach( $EM_Event->get_tickets()->tickets as $EM_Ticket ){
			$replace .= "<li>" .
							$EM_Ticket->ticket_name .
							"<br> - Available Space(s): ". $EM_Ticket->get_available_spaces() . ' <br> ' .
							" Booking Start Date " . $EM_Ticket->start() .
						"</li>";
		}
		$replace .= "</ul>";
	}
	return $replace;
}