<?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('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, $args);
}
}
}
// 增加监听walk事件
Event::listen('walk', function () {
echo "I am walking...n";
});
// 增加监听walk一次性事件
Event::listen('walk', function () {
echo "I am listening...n";
}, true);
// 触发walk事件
Event::trigger('walk');
/*
I am walking...
I am listening...
*/
Event::trigger('walk');
/*
I am walking...
*/
Event::one('say', function ($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');