Demonstrate namespace shadowing by PsySH

composer.json

{
    "name": "example/psysh-imports-shadow-namespaces",
    "require": {
        "nesbot/carbon": "^2.19",
        "psy/psysh": "^0.9.9"
    }
}

index.php

<?php

use Carbon\Carbon;
use Carbon\CarbonTimeZone;

require_once 'vendor/autoload.php';

$tz = new CarbonTimeZone('UTC');
$datetime = Carbon::today($tz);
print_r($datetime);