[李景山php]每天laravel-20160905|Dispatcher-5

    /**     * Fire an event and call the listeners.     *     * @param  string|object  $event     * @param  mixed  $payload     * @param  bool  $halt     * @return array|null     */    //    public function fire($event, $payload = [], $halt = false)    {// fire means to start        // call listeners        // When the given "event" is actually an object we will assume[like] it is an event        // object and use the class as the event name and this event itself as the        // payload to the handler, which makes object based events quite simple.        if (is_object($event)) {// determine is a object            list($payload, $event) = [[$event], get_class($event)];        }// set this as list function        // now i love this function        $responses = [];// prepare listener        // If an array is not given to us as the payload, we will turn it into one so        // we can easily use call_user_func_array on the listeners, passing in the        // payload to each of them so that they receive each of these arguments.        if (! is_array($payload)) {            $payload = [$payload];// be array        }// if it is a array        $this->firing[] = $event;// set this firing listener        if (isset($payload[0]) && $payload[0] instanceof ShouldBroadcast) {            $this->broadcastEvent($payload[0]);        }        foreach ($this->getListeners($event) as $listener) {            // use a function to return big array and list loop it            $response = call_user_func_array($listener, $payload);// cal_user_func_array// get response            // If a response is returned from the listener and event halting is enabled            // we will just return this response, and not call the rest of the event            // listeners. Otherwise we will add the response on the response list.            if (! is_null($response) && $halt) {                array_pop($this->firing);// if null array_pop it                return $response;// return it            }// add response on the response list            // If a boolean false is returned from a listener, we will stop propagating            // the event to any further listeners down in the chain, else we keep on            // looping through the listeners and firing every one in our sequence.            if ($response === false) {                break;            }// if response is null            $responses[] = $response;// otherwise        }        array_pop($this->firing);// pop it        return $halt ? null : $responses;    }