PHP Implementation Listener Event _php instance

How to implement event monitoring, referencing the jquery event binding idea, simple implementation.
Main function:
1. Binding events Support one event binding multiple actions, supporting binding one-time events
2. Trigger Event
3. Cancellation of events

Copy Code code as follows:

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);
}
}
}

Here are some examples of calls:

Copy Code code as follows:

Increase Listener Walk Events
Event::listen (' Walk ', function () {
echo "I am WALKING...N";
});
Increase the listening walk one-time event
Event::listen (' Walk ', function () {
echo "I am LISTENING...N";
}, True);
Trigger Walk Event
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 '); Output 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 ');