Route registration may fail if controller method name coincides with Facade name

[jnoordsij]

Laravel Version

13.6.0

PHP Version

8.5.5

Database Driver & Version

n/a

Description

When referring to a controller method by just a name inside a route group, with this method name being the same as a registered global alias from a Facade, an exception may occur.

I've been able to trace this back to the following clause returning true:

framework/src/Illuminate/Routing/Router.php

Lines 664 to 666 in 9f3dc9f

	if (class_exists($class)) {
	return $class;
	}

As class_exists does comparisons case-insensitive, this might yield true for all casings of Facade alias and other global aliases. However, likely due to the lazy loading nature of these, an immediate class_exists('request') call will be false, up until the point where an actual reference to the Request class has been observed, after which all casings will return the same result.

This is likely very low impact, as I've only managed to achieve this in testing (with cached routes I figure it is unlikely to happen due to loading orders) and moreover requires some oddly specific method names, although request might be out in the wild somewhere else...

Steps To Reproduce

1. Create a controller with a method that has a name that matches some facade (case-insensitive), e.g. request.
2. Have some code that uses the 'global' alias of a Facade, e.g. class_exists('Request') or new \Request().
3. Have some Route::group call setting the controller above, which contains a Route::get (or any method really) call that maps to the method from above.
4. An exception will occur

jnoordsij/laravel-laravel@06d05e4 contains a minimal test achieving this.

[crynobone]

I don't see any good solution for this at the moment.

1. As you said in the description, class_exists() is case-insensitive.
2. ReflectionClass is also case-insensitive.
3. get_declared_classes() also isn't reliable since class_exists('Request') will add the class under get_declared_classes() as "request" and not "Request"