php实现事件监听与触发实例程序

闲来无事,想了想PHP如何实现事件监听,参考了jQuery的事件绑定思路,简单的实现了一下.

主要功能:1.绑定事件 支持一个事件绑定多个动作,支持绑定一次性事件,2.触发事件,3.注销事件

php实现事件监听与触发实例程序,代码如下:

<?php
class Event  
{  
    protected static $listens = array();  
       
    public static function listen($event, $callback, $once=false){  
        if(!is_callable($callback)) return false;  
        self::$listens[$event][]    = array(&#39;callback&#39;=>$callback, &#39;once&#39;=>$once);  
        return true;  
    }  
       
    public static function one($event, $callback){  
        return self::listen($event, $callback, true);  
    }  
       
    public static function remove($event, $index=null){  
        if(is_null($index))  
            unset(self::$listens[$event]);  
        else 
            unset(self::$listens[$event][$index]);  
    }  
       
    public static function trigger(){  
        if(!func_num_args()) return;  
        $args                       = func_get_args();  
        $event                      = array_shift($args);  
        if(!isset(self::$listens[$event])) return false;  
        foreach((array) self::$listens[$event] as $index=>$listen){  
            $callback               = $listen[&#39;callback&#39;];  
            $listen[&#39;once&#39;] && self::remove($event, $index);  
            call_user_func_array($callback, $args);  
        }  
    }  
}
?>

以下是一些调用的例子:

<?php
// 增加监听walk事件  
Event::listen(&#39;walk&#39;, function(){  
    echo "I am walking...n";  
});  
// 增加监听walk一次性事件  
Event::listen(&#39;walk&#39;, function(){  
    echo "I am listening...n";  
}, true);  
// 触发walk事件  
Event::trigger(&#39;walk&#39;);  
/*  
I am walking...  
I am listening...  
*/ 
Event::trigger(&#39;walk&#39;);  
/*  
I am walking...  
*/ 
   
Event::one(&#39;say&#39;, function($name=&#39;&#39;){  
    echo "I am {$name}n";  
});  
   
Event::trigger(&#39;say&#39;, &#39;deeka&#39;); // 输出 I am deeka  
Event::trigger(&#39;say&#39;, &#39;deeka&#39;); // not run  
   
class Foo  
{  
    public function bar(){  
        echo "Foo::bar() is calledn";  
    }  
       
    public function test(){  
        echo "Foo::foo() is called, agrs:".json_encode(func_get_args())."n";  
    }  
}  
   
$foo    = new Foo;  
   
Event::listen(&#39;bar&#39;, array($foo, &#39;bar&#39;));  
Event::trigger(&#39;bar&#39;);  
   
Event::listen(&#39;test&#39;, array($foo, &#39;test&#39;));  
Event::trigger(&#39;test&#39;, 1, 2, 3);  
   
class Bar  
{  
    public static function foo(){  
        echo "Bar::foo() is calledn";  
    }  
}  
   
Event::listen(&#39;bar1&#39;, array(&#39;Bar&#39;, &#39;foo&#39;));  
Event::trigger(&#39;bar1&#39;);  
Event::listen(&#39;bar2&#39;, &#39;Bar::foo&#39;);  
Event::trigger(&#39;bar2&#39;);  
 
function bar(){  
    echo "bar() is calledn";  
}  
   
Event::listen(&#39;bar3&#39;, &#39;bar&#39;);  
Event::trigger(&#39;bar3&#39;); 
?>

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