- <?php
- /**
- * 事件
- *
- */
- 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);
- }
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/160120131690.html
来源: http://www.codesnippet.cn/detail/160120131690.html