Plugin.php

class Plugin extends \Phile\Plugin\AbstractPlugin
{
    protected $events = ['request_uri' => 'startup'];

    public function startup($data)
    {
        if ($data['uri'] === 'foo') {
            // matches URL
            $this->doStuffOnFoo();
            exit();
        }
    }

    protected function doStuffOnFoo()
    {
        echo 'Do foo';
    }
}