PHP code example of kuria / event

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

kuria / event example snippets

   

   use Kuria\Event\EventEmitter

   

   use Kuria\Event\Observable

   

   use Kuria\Event\EventEmitterPropInterface;
   use Kuria\Event\ObservableInterface;
   use Kuria\Event\ObservableTrait

   

   $observable->on('some.event', function ($arg1, $arg2) {
       // do something
   })

   

   $observable->off('some.event', $callback); // returns TRUE on success


Using an event listener
-----------------------

To register an event listener, use the ``addListener()`` method:

.. code:: php

   

   use Kuria\Event\EventListener

   

   $observable->removeListener($eventListener); // returns TRUE on success


Using an event subscriber
-------------------------

Event subscribers subscribe to a list of events. Each event is usually mapped
to one method of the subscriber.

The listeners can be created using the convenient ``listen()`` method
(as shown in the example below) or by manually creating ``EventListener``
instances.

- any callback or method can stop event propagation by returning ``FALSE``
- `listener priority`_ can be specified using 3rd argument of ``listen()``
  or the ``EventListener`` constructor

.. code:: php

   

   use Kuria\Event\EventSubscriber

   

   $subscriber->subscribeTo($observable)

   

   $subscriber->unsubscribeFrom($observable)

   

   use Kuria\Event\EventListener;
   use Kuria\Event\ObservableInterface

   

   $observable->emit('foo')

   

   $observable->emit('foo', 'hello', 123)

   
   
   use Kuria\Event\Observable

   
  
   $field = new Field('username');
   
   $field->on(FieldEvents::CHANGE, function (Field $field, $oldValue, $newValue) {
       echo "Field '{$field->getName()}' has been changed from '{$oldValue}' to '{$newValue}'\n";
   });
   
   $field->on(FieldEvents::CLEAR, function (Field $field) {
       echo "Field '{$field->getName()}' has been cleared\n";
   });
   
   $field->setValue('john.smith');
   $field->setValue('foo.bar123');
   $field->clear()