[php-src] Issue #12336: Intuitive way to convert constructor to closure

Issue: https://github.com/php/php-src/issues/12336 Author: mindplay-dk ### Description I wish one of these ways worked: ```php <?php class Foo { public function __construct(public string $lol) {} } $class = new ReflectionClass(Foo::class); // method 1: $ctor = $class->getConstructor()->getClosure(); // ReflectionMethod::getClosure(): Argument #1 ($object) cannot be null for non-static methods $classname = Foo::class; // method 2: $ctor = new $classname(...); // Fatal error: Cannot create Closure for new expression ``` I'd expect both approaches to work - a constructor is conceptually just a static function that generates a new instance, although the reflection facility doesn't treat it or report it as such. The second approach at least ought to work - for consistency with that feature. Even new Foo(...) doesn't work - and judging by the error message, someone predicted what I'm trying to do, but it just isn't supported... yet? is this feature planned? (I know there are ways to do it, using reflection, so you don't need to explain that - just wondering why this feature isn't available, as it would seem natural to expect this to work.)