Description:
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In simple cases, creating a class instance where the name of the class is in a string, it generally works as per the docs:

$a = 'myclass';
$b = new $a; //works

But if the class name is from an aliased import, it fails.

use Some\Project\myclass;
$a = 'myclass';
$b = new $a; //fails

Adding a __NAMESPACE__ prefix (as per bug #53904) doesn't work because it uses the current namespace, not the aliased one.

It's impossible to work around this with reflection because the class may not yet be loaded, so there seems to be no way of getting the namespace that an aliased name belongs to.

I think this is a bug (or feature) in the order of resolving the class name before creating it. PHP resolves the class name but does not apply alias mappings to it before using it.

Test script:
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<?php
namespace my\project;

require 'vendor/autoload.php';

use League\OAuth2\Client\Provider\Google;
use Stevenmaguire\OAuth2\Client\Provider\Microsoft;

$provider = 'Google';
$nprovider = __NAMESPACE__ . $provider;

$a = new Google; //Succeeds
$a = new $provider; //Fails
$a = new $nprovider; //Fails - wrong namespace