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:
- 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, $args);
- }
- }
- }
- 以下是一些调用的例子:
-
- Event::listen('walk', function(){
- echo "I am walking...n";
- });
-
- Event::listen('walk', function(){
- echo "I am listening...n";
- }, true);
-
- Event::trigger('walk');
-
-
-
-
- Event::trigger('walk');
-
-
-
-
- Event::one('say', function($name=''){
- echo "I am {$name}n";
- });
-
- Event::trigger('say', 'deeka');
- Event::trigger('say', 'deeka');
-
- 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');
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