Too much new lines even when there's no real benefit. The [PSR-2 standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md#1-overview) defines that there's no hard limit on the length of lines and 120 characters is the soft limit. I believe trying to stay within the 80 characters is asking too much from PHP code, 100 is the sweet spot.

```php
$this->streamCallback = function ($stream, $flags) {
    $key = (int) $stream;

    if (Event::READ === (Event::READ & $flags) && isset($this->readListeners[$key])) {
        call_user_func($this->readListeners[$key], $stream, $this);
    }

    if (Event::WRITE === (Event::WRITE & $flags) && isset($this->writeListeners[$key])) {
        call_user_func($this->writeListeners[$key], $stream, $this);
    }
};
```

Phpdoc comments within the 80 characters length are perfectly fine on the other hand.