Messenger

A straightforward php publish/subscribe library.

Usage

Messenger lets you subscribe to functions and then trigger them when messages are sent from other parts of your application.

use harryhope\Messenger;

To subscribe:

Messenger::on('name change', function($name) {
    print 'Hello, ' . $name;
});

Named or anonymous functions can be used as subscriptions.

$greeting = function($name) {
    print 'How are you today, ' . $name;
};

Messenger::on('name change', $greeting);

Unsubscribe to a specific message + named callback combination, or to all messages of a given message name by calling the off method without the second parameter.

// Remove one message + callback pairing
Messenger::off('name change', $greeting);

// Remove everything with the message 'name change'
Messenger::off('name change');

Use the send method to trigger associated subscriptions.

Messenger::send('name change', 'Dave');

Messenger also allows for method chaining.

Messenger::on('name change', $change_name)->on('day change', $change_day);

Messenger::send('name change', 'Dave')
         ->send('day change', 'Tuesday');