<?PHP
	class fu
	{
		protected $__defaultConfig = [];
		public function __construct()
		{
			$class = get_called_class();
			$props = [];

			do
			{
				foreach((new \ReflectionClass($class))->getDefaultProperties() as $property => $value) // <---
				{
					if(!in_array($property, ['__autoConfig', '__defaultConfig']))
						continue;
					
					var_dump([$class.'::'.$property => $value]);
				}
			}
			while($class = get_parent_class($class));

			/*
			// same...
			foreach($this->parents() as $class)
			{
				foreach((new \ReflectionClass($class))->getDefaultProperties() as $property => $value)
				{
					if(!in_array($property, ['__autoConfig', '__defaultConfig']))
						continue;
					
					var_dump([$class.'::'.$property => $value]);
				}
			}
			*/
		}
	}

	class baz extends fu
	{
		protected $__defaultConfig = [];
	}
?>


// actual

array(1) {
  ["fu::__defaultConfig"]=>
  array(7) {
    ["scheme"]=>
    string(4) "http"
    ["query"]=>
    NULL
    ["fragment"]=>
    NULL
    ["protocol"]=>
    NULL
    ["auth"]=>
    NULL
    ["version"]=>
    string(3) "1.1"
    ["headers"]=>
    array(0) {
    }
  }
}
array(1) {
  ["baz::__defaultConfig"]=>
  array(7) {
    ["scheme"]=>
    string(4) "http"
    ["query"]=>
    NULL
    ["fragment"]=>
    NULL
    ["protocol"]=>
    NULL
    ["auth"]=>
    NULL
    ["version"]=>
    string(3) "1.1"
    ["headers"]=>
    array(0) {
    }
  }
}

// expected

array(1) {
  ["fu::__defaultConfig"]=>
  array(7) {
    ["scheme"]=>
    string(4) "http"
    ["query"]=>
    NULL
    ["fragment"]=>
    NULL
    ["protocol"]=>
    NULL
    ["auth"]=>
    NULL
    ["version"]=>
    string(3) "1.1"
    ["headers"]=>
    array(0) {
    }
  }
}
array(1) {
  ["baz::__defaultConfig"]=>
  array(7) {
    ["scheme"]=>
    string(4) "tcp"
    ["host"]=>
    string(9) "localhost"
    ["port"]=>
    NULL
    ["username"]=>
    NULL
    ["password"]=>
    NULL
    ["path"]=>
    NULL
    ["body"]=>
    array(0) {
    }
  }
}