【www.bbyears.com--jquery】
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
class Event
{
protected static $listens = array();
public static function listen($event, $callback, $once=false){
if(!is_callable($callback)) return false;
self::$listens[$event][] = array("callback"=>$callback, "once"=>$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["callback"];
$listen["once"] && self::remove($event, $index);
call_user_func_array($callback, $args);
}
}
}
以下是一些调用的例子:
代码如下// 增加监听walk事件
Event::listen("walk", function(){
echo "I am walking...n";
});
// 增加监听walk一次性事件
Event::listen("walk", function(){
echo "I am listening...n";
}, true);
// 触发walk事件
Event::trigger("walk");
/*
I am walking...
I am listening...
*/
Event::trigger("walk");
/*
I am walking...
*/
Event::one("say", function($name=""){
echo "I am {$name}n";
});
Event::trigger("say", "deeka"); // 输出 I am deeka
Event::trigger("say", "deeka"); // 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";
}
}
$foo = new Foo;
Event::listen("bar", array($foo, "bar"));
Event::trigger("bar");
Event::listen("test", array($foo, "test"));
Event::trigger("test", 1, 2, 3);
class Bar
{
public static function foo(){
echo "Bar::foo() is calledn";
}
}
Event::listen("bar1", array("Bar", "foo"));
Event::trigger("bar1");
Event::listen("bar2", "Bar::foo");
Event::trigger("bar2");
function bar(){
echo "bar() is calledn";
}
Event::listen("bar3", "bar");
Event::trigger("bar3");