PHP - Can't assign values to a class variable in __construct()

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First of all, sorry if my english is bad.

I'm making a REST API Server in PHP using OOP Paradigm. But, I'm having troubles when i try to assign the $_params array in the __construct method of Addestablishment class (I made a var_dump($this->$_params) and the system printed me NULL)

This is the URL that i'm passing

http://ift.tt/1uPjMx3

So, i append the code

include_once 'models/Addestablishment_Model.php';

try {
    $params = $_REQUEST;

    $controller = ucfirst(strtolower($params['controller']));

    $action = strtolower($params['action']).'Action';

    if( file_exists("controllers/{$controller}.php") ) {
        include_once "controllers/{$controller}.php";
    } else {
        throw new Exception('Controller is invalid.');
    }

    $controller = new $controller($params);

    if( method_exists($controller, $action) === false ) {
        throw new Exception('Action is invalid.');
    }

    //execute the action
    $result['data'] = $controller->$action();
    $result['success'] = true;

} catch( Exception $e ) {
    $result = array();
    $result['success'] = false;
    $result['errormsg'] = $e->getMessage();
}

echo json_encode($result);
exit();

And, in the $action method, i have the following code (my controller class)

class Addestablishment
{
    private $_params = array();

    public function __construct($params)
    {
        $this->_params = $params;
        var_dump($this->_params); //i got null here :(
    }

    public function createAction()
    {
        $obj_NewEstablishment = new Addestablishment_Model(
                $this->_params['name'],
                $this->_params['type'],
                $this->_params['address'],
                $this->_params['location'],
                $this->_params['zip'],
                $this->_params['state'],
                $this->_params['country']
        );


        return $obj_NewEstablishment->toArray();
    }

And the response of my api is the next

{"data":{"establishment_name":null,"establishment_type":null,"establishment_address":null,"establishment_location":null,"establishment_zip":null,"establishment_state":null,"establishment_country":null},"success":true}

Thanks for reading my question, maybe is an stu**d mistake but I'm newbie in PHP - OOP and programming RESTful API

asked 42 secs ago

Carlos Garnica Jr.

6

PHP - Can't assign values to a class variable in __construct()