鉴于大家对PHP十分关注，我们编辑小组在此为大家搜集整理了“PHP 事件机制(2)”一文，供大家参考学习!

复制代码 代码如下:
<?php
class Event extends stdClass{
public $target=null;
public $type=null;
/**
* 创建事件
* @param string $type
*/
public function __construct($type){
$this->type=trim($type);
}
/**
* 得到事件字符串
*/
public function __toString(){
return $this->type;
}
}

abstract class EventDispatcher{
private callback_method;
/**
* 添加事件
* @param Event $event
* @param string $method
* @param string||object $class
* @return boolean true
*/
public function attach($event,$method,$class=null){
$eventstr=(string)$event;
if($this->has($event,$method,$class))
return true;
if($class!=null){
$this->_check_method($class,$method);
$this->_callback_method[$eventstr][]=$this->_create_listener_method($eventstr,$class,$method);
}else{
$this->_check_function($method);
$this->_callback_method[$eventstr][]=$this->_create_listener_fn($eventstr,$method);
}
return true;
}
/**
* 派发事件
* @param Event $event
* @param string $method
* @param string||object $class
* @return void
*/
public function dispatch(Event $event){
$event->target=$this;
$eventstr=(string)$event;
if($this->_check_callback($eventstr)){
foreach ($this->_callback_method[$eventstr] as $v){
if($v[''object'']){
if(is_object($v[''class''])){
$v[''class'']->$v[''method'']($event);
}else{
call_user_func(array($v[''class''], $v[''method'']),$event);
}
}else{
$v[''function'']($event);
}
}
}
}
/**
* 删除事件
* @param Event $event
* @param string $method
* @param string $class
* @return boolean true
*/
public function detact($event,$method,$class=null){
$eventstr=(string)$event;
if(!$this->_check_callback($eventstr))
return true;
if(!$this->has($event,$method,$class))
return true;
if($class!=null){
$this->_check_method($class,$method);
foreach ($this->_callback_method[$eventstr] as $k=>$v) {
if(($v==$this->_create_listener_method($eventstr,$class,$method))){
unset($this->_callback_method[$eventstr][$k]);
return true;
}
}
return true;
}else{
$this->_check_function($method);
foreach ($this->_callback_method[$eventstr] as $k=>$v) {
if(($v==$this->_create_listener_fn($eventstr,$method))){
unset($this->_callback_method[$eventstr][$k]);
return true;
}
}
return true;
}
}
/**
* 检测事件是否监听
* @param Event $event
* @param string $method
* @param string $class
* @return boolean
*/
public function has($event,$method,$class=null){
$eventstr=(string)$event;
if(($class!=null)){
$this->_check_method($class,$method);
if($this->_check_callback($eventstr)){
foreach($this->_callback_method[$eventstr] as $v){
if(is_object($v[''class''])){
$v_class=get_class($v[''class'']);
}else{
$v_class=$v[''class''];
}
if(is_object($class)){
$s_class=get_class($class);
}else{
$s_class=$class;
}
$temp_v=array(
"class"=>$v_class,
"method"=>$method,
);
$temp_s=array(
"class"=>$s_class,
"method"=>$method,
);
if($temp_v==$temp_s){
return true;
}
}
}
}else{
$this->_check_function($method);
if($this->_check_callback($eventstr)){
fore