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PubSub class for PHP
<?php
class PubSub {
private static $events = array(); // all subscriptions
// Don't allow PubSub to be initialized outside this class
private function __construct() {}
private function __clone() {}
/**
* Adds a subscription to the stack
*
* @param string $name
* @param function $callback needs to be callable with call_user_func()
* @return void
* @author Baylor Rae'
*/
public static function subscribe($name, $callback) {
// Make sure the subscription isn't null
if( empty(self::$events[$name]) )
self::$events[$name] = array();
// push the $callback onto the subscription stack
array_push(self::$events[$name], $callback);
}
/**
* Calls the last subscription in the stack
*
* @param string $name
* @param string $params
* @return false if fails
* @author Baylor Rae'
*/
public static function publish($name, $params = '') {
// Check to see if the subscribe isn't null
if( empty(self::$events[$name]) )
return false;
// Gets all parameters passed to the function
// and removes the first, which is $name
$params = func_get_args();
array_shift($params);
// If there's only one event, then call it and return the value
if( count(self::$events[$name]) === 1 ) {
if( is_callable(self::$events[$name][0]) )
return call_user_func_array(self::$events[$name][0], $params);
else
return false;
}
// Loop through all the events and call them
foreach( self::$events[$name] as $event ) {
if( is_callable($event) )
call_user_func_array($event, $params);
}
}
public static function unsubscribe($name) {
if( !empty(self::$events[$name]) )
unset(self::$events[$name]);
}
}
if( basename(__FILE__) === 'pubsub.php' ) {
// Basic usage
PubSub::subscribe('beforeSave', function() {
echo 'PubSub::beforeSave';
});
PubSub::subscribe('afterSave', function() {
echo 'PubSub::afterSave';
});
// PubSub::unsubscribe('beforeSave');
PubSub::publish('beforeSave');
}

How to use?
For every subscribe , we need to call publish Manually ?

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