problema-uri-simple-router-phpoo.php

<?php
// errado
namespace app\helpers;

class Uri
{
    public static function get($type): string
    {
        return parse_url($_SERVER['REQUEST_URI'][$type]);
    }
}

// correto 
namespace app\helpers;

class Uri
{
    public static function get($type): string
    {
        return parse_url($_SERVER['REQUEST_URI'])[$type];
    }
}