Php autoloading not working in symfony dispatcher example - php

Question

I am trying to just check out the symfony event dispatcher class and i have been following this online tutorial , so i have the following in my index.php file:
<?php
require('vendor/autoload.php');
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\EventDispatcher\EventDispatcher;
$dispatcher = new EventDispatcher;
$dispatcher->addListener('UserSignedUp' , function(Event $event){
// die('Handling It !!');
var_dump($event);
});
$event = new App\Events\UserSignedUp( (object) [ 'name' => 'gautam' , 'email' => 'gautamz07#yahoo.com' ] );
$dispatcher->dispatch('UserSignedUp' , $event);
and i have the following directory structure:
event_dis
- app
- events
- UserSignUp.php
- vendor
- index.php
- composer.json
I have the following in my composer.json file:
{
"require": {
"symfony/event-dispatcher": "^3.2"
},
"autoload" : {
"psr-4" : {
"App\\" : "app/"
}
}
}
The UserSignedUp.php class looks like the following :
<?php
namespace App\Events;
class UserSignedUp extends Event {
public $user;
public function __construct($user) {
$this->user = $user;
}
}
Now since i have the following line in my index.php file:
$event = new App\Events\UserSignedUp( (object) [ 'name' => 'gautam' , 'email' => 'gautamz07#yahoo.com' ] );
The UserSignedUp class gets called and i get the following error in my browser:
Class 'App\Events\Event' not found in C:\xampp\htdocs\symfony_compo\event_dis\app\Events\UserSignedUp.php on line 6
Now why am i getting this error , in the tutorial this same example works perfectly, but on my local machine this does't , can somebody tell me what am i doing wrong here ??

Answer 1

Event class does not exists in App\Events namespace. You should edit UserSignedUp.php and add use Symfony\Component\EventDispatcher\Event;:
<?php
namespace App\Events;
use Symfony\Component\EventDispatcher\Event;
class UserSignedUp extends Event {
public $user;
public function __construct($user) {
$this->user = $user;
}
}