PHP实现的事件机制,感兴趣的小伙伴,下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下:
<?PHP
/**
* 事件机制
*
* @param
* @author 编程之家 jb51.cc jb51.cc
**/
class Event {
private $callbacks = array();
private $holder;
function __construct() {
$bt = debug_backtrace();
if (count($bt) < 2) {
$this->holder = null;
return;
}
$this->holder = &$bt[1]['object'];
}
function attach() {
$args = func_get_args();
switch (count($args)) {
case 1:
if (is_callable($args[0])) {
$this->callbacks[]= $args[0];
return;
}
break;
case 2:
if (is_object($args[0]) && is_string($args[1])) {
$this->callbacks[]= array(&$args[0],$args[1]);
}
return;
default:
return;
}
}
function notify() {
$bt = debug_backtrace();
if ($this->holder &&
((count($bt) >= 2 && $bt[count($bt) - 1]['object'] !== $this->holder)
|| (count($bt) < 2))) {
throw(new Exception('Notify can only be called in holder'));
}
foreach ($this->callbacks as $callback) {
$args = func_get_args();
call_user_func_array($callback,$args);
}
}
}
/*** 代码来自编程之家 jb51.cc(jb51.cc) ***/