Question: Is it possible to access a sub-property of an object dynamically? I managed it to access the properties of an object, but not the properties of a sub-object.

Here is an example of the things I want to do:

```
class SubTest
{
    public $age;

    public function __construct($age)
    {
        $this->age = $age;
    }
}

class Test
{
    public $name;
    public $sub;

    public function __construct($name, $age)
    {
        $this->name = $name;
        $this->sub = new SubTest($age);
    }
}

$test = new Test("Mike", 43);

// NOTE works fine
$access_property1 = "name";
echo $test->$access_property1;

// NOTE doesn't work, returns null
$access_property2 = "sub->age";
echo $test->$access_property2;

```

Answer: 
The jQuery $.post function sends a post request to the server, which means to access the value of "result", you need to get it from the $\_POST superglobal.

Try $\_POST['result'] instead of $\_SERVER['result'].

These descriptions may help (source: <http://www.nusphere.com/php/php_superglobals.htm>):

* **$\_POST**- The $\_POST Superglobal represents data sent to the PHP
script via HTTP POST. This is
normally a form with a method of
POST.
* **$\_SERVER**- The $\_SERVER Superglobal represents data available
to a PHP script from the Web server
itself (not what you're looking for)
* **$\_REQUEST**- The $\_REQUEST Superglobal is a combination of
$\_GET, $\_POST, and $\_COOKIE (would
work, but why search GET and COOKIE
when you know the value is in POST?)
Try doing:

```
echo $_POST['result'];

```