Calling a PHP class method using AJAX

Calling a PHP class method using AJAX

I have come up with the following bits of code to call a method via AJAX
in my PHP classes:
PHP:
class Ajax extends Controller {
private $class;
private $method;
private $params;
function __construct()
{
$this->params = $_POST; // Call params
$call = explode('->', $this->params['call']);
$this->class = new $call[0]; // e.g. controller->method
$this->method = $call[1];
array_shift($this->params);
$this->parse();
}
public function index()
{
//Dummy
}
public function parse()
{
$r = '';
$r = call_user_func_array(array($this->class, $this->method),
$this->params);
echo $r;
}
}
Client:
function creditCheck2(id)
{
$.post(ROOT + 'Ajax', {call: 'Record->creditState', id: id, enquiryid:
enquiryId}, function(data) {
alert(data)
}, 'json')
}
It seems to work great, but is it secure and could it be better?