Description:
------------
using get_object_vars() on a mysqli object returns an empty array.  As I am able to access vars such as host_info via $mysqliObj->host_info, i would expect this to be a public var, which I would expect to be returned from get_object_vars($mysqliObj).  to test this, i defined a test class with a public var, a private var, and a protected var.  after instatiating the class an setting each of the vars to a string value, i called get_object_vars() on the object and as expected, only the public var was returned in the array from the function.

I also tested get_class_methods() and get_class_vars() on the mysqli object.  get_class_methods() does return an array of method names.  get_class_vars() returns an empty array.  these tests are NOT included in the attached code.

Reproduce code:
---------------
<?php
class testClass {
	public $a;
	private $b;
	protected $c;
	public function test() {
		$this->a = "a";
		$this->b = "b";
		$this->c = "c";
	}
}

$mysqli = new mysqli("localhost", "root", "vnbeRTC", "mysql");
echo "mysqli class:\n";
echo "host info: ".$mysqli->host_info."\n\n";  // direct access, public var???
echo "get_object_vars(\$mysqli)\n";
print_r(get_object_vars($mysqli)); // prints empty array
$mysqli->close();
echo "\ntestClass class:\n";
$test = new testClass;
$test->test();
echo "get_object_vars(\$test)\n";
print_r(get_object_vars($test)); // prints public vars only (expected)
print_r(get_class_vars($test)); // strange output for protected var name
?>

Expected result:
----------------
array returned from get_object_vars() on a mysqli object would return an array containing all public vars in the object.

Actual result:
--------------
the returned array was empty.