Tag a user by simply just posting his name like @Nick and if found, returns a tooltip.
fusion_parse_user( string $user_name [, string $tooltip ] ) : string
$user_name (string) (Required) @Nick.
$tooltip (string) (Optional) Additional info (E.g. $userdata['user_lastvisit']-120 < TIME ? 'Online' : 'Offline'). Default value: ''
(string) Tooltip with info.
$user_name = '@Nick';
echo fusion_parse_user($user_name);