Question

这是事件驱动模块我在创建新的处理程序时遇到问题，例如$ qm-＆gt; addEventListener（'adding'，function（$ x）{$ x = 5;}）;然后 $ qm-＆gt; addEventListener（'adding'，function（$ x）{echo $ x;}）;我怎么能做这样的工作？什么也没有回报。

<?php
class Event {
    private $eventName;
    function __construct($eventName){
        $this->eventName = $eventName;
    }
    public function name() {
        return $this->eventName;
    }
}
class QueueManager {
    private $registeredHandlers = array();
    public function addEventListener($eventName, $handler) {
        if (!is_array($this->registeredHandlers[$eventName]))    $this->registeredHandlers[$eventName] = array();
        $this->registeredHandlers[$eventName][] = $handler;
    }
    public function dispatch($event) {
        $eventName = $event->name();
        if (!$this->registeredHandlers[$eventName]) return;
        foreach ($this->registeredHandlers[$eventName] as $handler) $handler();
    }
}

$qm = new QueueManager();
$qm->addEventListener('click', function(){echo 'ok1';}); //something like this working
$qm->addEventListener('click', function(){echo 'ok2';});
$qm->addEventListener('adding', function($x){$x = 5;});  //something like this not working
$qm->addEventListener('adding', function($x){$x++;});
$qm->addEventListener('adding', function($x){echo $x;});
$clickEvent = new Event('click');
$qm->dispatch($clickEvent);
?>

Answer 1

很难，因为您不仅需要将变量传递给添加事件处理程序，还需要通过引用传递

您需要修改事件回调以通过引用处理调用;然后利用PHP 5.6变量：

class Event {
    private $eventName;
    function __construct($eventName){
        $this->eventName = $eventName;
    }
    public function name() {
        return $this->eventName;
    }
}
class QueueManager {
    private $registeredHandlers = array();
    public function addEventListener($eventName, $handler) {
        if (!isset($this->registeredHandlers[$eventName]) || !is_array($this->registeredHandlers[$eventName]))    $this->registeredHandlers[$eventName] = array();
        $this->registeredHandlers[$eventName][] = $handler;
    }
    public function dispatch($event, &...$args) {
        $eventName = $event->name();
        if (!$this->registeredHandlers[$eventName]) return;
        foreach ($this->registeredHandlers[$eventName] as $handler) call_user_func_array($handler, $args);
    }
}

$qm = new QueueManager();
$qm->addEventListener('click', function(){echo 'ok1';}); //something like this working
$qm->addEventListener('click', function(){echo 'ok2';});
$qm->addEventListener('adding', function(&$x){$x = 5;});  //something like this not working
$qm->addEventListener('adding', function(&$x){$x++;});
$qm->addEventListener('adding', function($x){echo $x;});

$clickEvent = new Event('click');
$qm->dispatch($clickEvent);

$addingEvent = new Event('adding');
$value;
$qm->dispatch($addingEvent, $value);

Answer 2

在这里查看答案： php event system implementation

它向您展示了如何正确编写调度。

如何在事件驱动模块中使功能工作？

2 个答案: