php实现事件监听与触发的方法
本文实例讲述了php实现事件监听与触发的方法。分享给大家供大家参考。具体分析如下：
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
复制代码 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);
}
}
}
{
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, $args);
}
}
}
以下是一些调用的例子：
复制代码 代码如下:
// 增加监听walk事件
Event::listen('walk', function(){
echo "I am walking...n";
});
// 增加监听walk一次性事件
Event::listen('walk', function(){
echo "I am listening...n";
}, true);
// 触发walk事件
Event::trigger('walk');
/*
I am walking...
I am listening...
*/
Event::trigger('walk');
/*
I am walking...
*/
Event::one('say', function($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($foo, 'test'));
Event::trigger('test', 1, 2, 3);
class Bar
{
public static function foo(){
echo "Bar::foo() is calledn";
}
}
Event::listen('bar1', array('Bar', 'foo'));
Event::trigger('bar1');
Event::listen('bar2', 'Bar::foo');
Event::trigger('bar2');
function bar(){
echo "bar() is calledn";
}
Event::listen('bar3', 'bar');
Event::trigger('bar3');
Event::listen('walk', function(){
echo "I am walking...n";
});
// 增加监听walk一次性事件
Event::listen('walk', function(){
echo "I am listening...n";
}, true);
// 触发walk事件
Event::trigger('walk');
/*
I am walking...
I am listening...
*/
Event::trigger('walk');
/*
I am walking...
*/
Event::one('say', function($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');
希望本文所述对大家的PHP程序设计有所帮助。