Support getting reflection of an anonymous function

[Lctrs]

From https://www.php.net/manual/en/class.closure.php :

Besides the methods listed here, this class also has an __invoke method.

[ondrejmirtes]

Hi, I don't understand what you're trying to achieve. Can you first post something on phpstan.org that fails?

[Lctrs]

Hi @ondrejmirtes,

Well, nothing fails.

In rectorphp/rector#2658, I worked on a class that could resolve any calls (FuncCall|MethodCall|StaticCall) to the called function or method reflection (FunctionReflection|MethodReflection).

I had one problem when FuncCall::$name is an Expr (can be obtained with eg $f = function() {}; $f();). I could not get the real signature of the function (the one without the $newthis param). So I implemented this to resolve my case. I thought maybe you would consider this a valid case and accept a PR for this.

I don't know if I did the right thing though. Here is where I implemented it, maybe you can understand me better with this.

[ondrejmirtes]

For $expr(), Type::getCallableParametersAcceptors() should be used. Maybe this will simplify the logic you implemented in Rector too?

[ondrejmirtes]

It works with this too for example:

$func = 'date';
$func();

So ConstantStringType::getCallableParametersAcceptors() also answers this correctly.

[Lctrs]

Something like this ?

$type = $scope->getType($funcCall->name);
$parametersAcceptors = $type->getCallableParametersAcceptors($scope);

return new NativeFunctionReflection(
    '{closure}', //TODO: get real name
    $parametersAcceptors,
    null,
    TrinaryLogic::createMaybe()
);

Is this the PHPStan way of doing the following ?

$f = function() {};
$r = new \ReflectionFunction($f);

$f = 'date';
$r = new \ReflectionFunction($f);

[ondrejmirtes]

Not sure what you need FunctionReflection, but yeah, something like that.