gistfile1.php

<?php
/**
 * Return HTML for a single blog user for the widget.
 *
 * @uses apply_filters() Calls 'wpwhosonline_author_link' on the author link element
 * @return string HTML for the user row
 */
function wpwhosonline_user( $last_online_ts, $user ) {
	$avatar = get_avatar( $user->user_email, 32 );
	$name = $user->display_name;
	$link = '<a href="/members/' . get_author_posts_url( $user->ID, $user->user_nicename ) . '" title="' . esc_attr( sprintf(__("Posts by %s"), $user->display_name) ) . '">' . $name . '</a>';

	$link = apply_filters( 'wpwhosonline_author_link', $link, $user );

	// this should always exist; we queried using this meta
	if ( ! $last_online_ts ) {
		continue;
	}

	$now = time();
	if ( $now - $last_online_ts < 120 ) {
		$last_online = 'Online now!';
	} else {
		$last_online = human_time_diff( $now, $last_online_ts ) . ' ago';
	}

	$last_online_title = date_i18n( get_option('date_format') . ' ' . get_option('time_format'), $last_online_ts );

	if ( $last_online ) {
		$last_online = '<span title="Last online: ' . esc_attr( $last_online_title ) . '">' . $last_online . '</a>';
	}

	return $avatar . $link . '<br>' . $last_online;
}

function wpwhosonline_class( $lastonline ) {
	$diff = time() - $lastonline;
	if( $diff > 7200 ) {
		return 'wpwhosonline-ancient';
	} elseif( $diff > 600 ) {
		return 'wpwhosonline-recent';
	} else {
		return 'wpwhosonline-active';
	}
}