标签：function return public null itself
/**
* 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;
}本文出自 “专注php” 博客，请务必保留此出处http://jingshanls.blog.51cto.com/3357095/1791598
[李景山php]每天laravel-20160905|Dispatcher-5
标签：function return public null itself
原文地址：http://jingshanls.blog.51cto.com/3357095/1791598
