src/Bot/Manager.php
public function isMatch(Event $event)
    {
        if (is_callable($this->checker)) {
            return call_user_func($this->checker, $event);
        }
        return false;
    }
public function isMatch(Event $event)
    {
        if (is_callable($this->checker)) {
            return call_user_func($this->checker, $event);
        }
        return false;
    }
public function isMatch ( Event $ event ) { if ( is_callable ( $ this -> checker ) ) { return call_user_func ( $ this -> checker , $ event ) ; } return false ; }
While event checker match current event?

@param  \Viber\Api\Event $event
@return boolean
While event checker match current event?