The definition and implementation of PHP for event mechanism

This article mainly introduces the PHP to the event mechanism definition and the realization, the interest friend's reference, hoped to have the help to everybody.

This article describes the PHP implementation of the event mechanism of the method, specifically as follows:

<?php/*** Events */class Event {Private $callbacks = array (); private $holder; function __construct () {$BT = Debug_backtr  Ace ();   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 is called in Holder '));   } foreach ($this->callbacks as $callback) {$args = Func_get_args ();  Call_user_func_array ($callback, $args); } }}

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