When the user logout, the number of people online will be lost

Hi

There is an important issue with your plugin. When a user logout, all guest users are removed from the sftrack table

the reason:
You used the following actions and functions to display users’ statistics when login and out:

add_action('wp_login', 'sp_track_login');
add_action('wp_logout', 'sp_track_logout');

function sp_track_login() {
	# if user was logged as guest before logging in, remove the guest entry
	$ip = sp_get_ip();
	SP()->DB->execute("DELETE FROM ".SPTRACK." WHERE trackname='".$ip."'");
}

function sp_track_logout() {
	global $current_user;

	sp_set_last_visited($current_user->ID);
	SP()->DB->execute("DELETE FROM ".SPTRACK." WHERE trackuserid=".$current_user->ID);

	# clear the users search cache
	SP()->cache->delete('search');
}

The action used for user logout is incorrect with your function.

You should use the following action:
add_action('clear_auth_cookie', 'sp_track_logout', 10);

Otherwise the return value of the $current_user->ID is 0 or false, so all online guests will be removed from the “sptrack” table

wordpress: latest version
simple press: latest version