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4. How to Customize a Method Behavior without Using Inheritance

How to Customize a Method Behavior without Using Inheritance

class Foo
{
    // ...

    public function send($foo, $bar)
    {
        // do something before the method
        $event = new FilterBeforeSendEvent($foo, $bar);
        $this->dispatcher->dispatch('foo.pre_send', $event);

        // get $foo and $bar from the event, they may have been modified
        $foo = $event->getFoo();
        $bar = $event->getBar();

        // the real method implementation is here
        $ret = ...;

        // do something after the method
        $event = new FilterSendReturnValue($ret);
        $this->dispatcher->dispatch('foo.post_send', $event);

        return $event->getReturnValue();
    }
}

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public function onFooPostSend(FilterSendReturnValue $event)
{
    $ret = $event->getReturnValue();
    // modify the original ``$ret`` value

    $event->setReturnValue($ret);
}