Bug report

From #5368

Thus is_callable() will fail when checking for a non-static method with a classname (must check with an object instance).

PHPStan also does not error when using call_user_func.

Comment in parent issue:

Should be handled in ConstantArrayType::getCallableParametersAcceptors();

Actually, the following does error

HelloWorld::sayHello('FOO');

But not when call_user_func is invoked.

Code snippet that reproduces the problem

<?php declare(strict_types = 1);

class HelloWorld
{
    public function sayHello(string $date): void
    {
        echo 'Hello, ' . $date;
    }
}

if (is_callable([HelloWorld::class, 'sayHello'])) {
    // always false.
}
if (is_callable('HelloWorld::sayHello')) {
    // always false.
}

$hello = new HelloWorld();
if (is_callable([$hello, 'sayHello'])) {
    // always true.
}

// Valid
$hello->sayHello('ABC');
call_user_func([$hello, 'sayHello'], 'foo');

// Will error
call_user_func([HelloWorld::class, 'sayHello']);

https://phpstan.org/r/12fd1cbe-3da1-4885-8328-748a21f94235

Expected output

The is_callable to non-static methods should say always returns false.

And the call_user_func statically should report

Argument #1 ($callback) must be a valid callback, non-static method HelloWorld::sayHello() cannot be called statically

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