PHP event Mechanism (2) _php tutorial

Copy CodeThe code is as follows:
Class Event extends stdclass{
public $target =null;
Public $type =null;
/**
* Create Event
* @param string $type
*/
Public function __construct ($type) {
$this->type=trim ($type);
}
/**
* Get Event String
*/
Public Function __tostring () {
return $this->type;
}
}

Abstract class eventdispatcher{
Private $_callback_method;
/**
* Add Event
* @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;
}
/**
* Distribution of events
* @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);
}
}
}
}
/**
* Delete Event
* @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;
}
}
/**
* Detects if the event is listening
* @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)) {
foreach ($this->_callback_method[$eventstr] as $v) {
if ($method = = $v [' function ']) {
return true;
}
}
}
}
return false;
}
/**
* Detects whether the specified class has a specified method
* @param string $class
* @param string $method
* @exception exception_event
* @return void
*/
Private Function _check_method ($class, $method) {
if (!method_exists ($class, $method)) {
throw new Exception (Get_class ($class). "Not exist". $method. "Method", 1);
}
}
/**
* Detects if the specified function exists
* @param string $function
* @return void
*/
Private Function _check_function ($function) {
if (!function_exists ($function)) {
throw new Exception ($function. "Function not exist", 2);
}
}
/**
* Detects if a listener function exists for the specified event
* @param string $eventstr
* @return Boolean
*/
Private Function _check_callback ($EVENTSTR) {
if (Isset ($this->_callback_method[$eventstr])
&&is_array ($this->_callback_method[$eventstr])
){
return true;
}
return false;
}
/**
* Create an array of listener functions
* @param string $eventstr
* @param string $function
* @return Array
*/
Private Function _create_listener_fn ($EVENTSTR, $function) {
Return Array (
"Object" =>false,
"Function" = $function,
);
}
/**
* Create an array of listener classes
* @param string $eventstr
* @param string $class
* @param string $method
* @return Array
*/
Private Function _create_listener_method ($eventstr, $class, $method) {
Return Array (
"Object" =>true,
"Class" = $class,
"Method" = $method,
);
}
}



Class MyEvent extends event{
Const aa= ' AAA ';
}
Class Ball extends eventdispatcher{
Public Function aa () {
$event =new MyEvent (MYEVENT::AA);
$this->dispatch ($event);
}
}

Class MyTest {
Public Function test () {
$ball =new Ball ();
$ball->attach (MYEVENT::AA, ' KK ');
$ball->aa ();
}
Public Function KK ($e) {
Print_r ($e);
}
}


try{
$t =new mytest ();
$t->test ();
}catch (Exception $e) {
echo $e->getmessage ();
}

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