Accessing protected and private properties

NikTest.php

<?php


class Nik
{
    public $name;
    protected $_function;
    private $_age;

    private function _getProperties()
    {
        $properties = array_keys(get_object_vars($this));
        $list = array ();
        foreach ($properties as $property) {
            $clean = str_replace('_','', $property);
            $list[$clean] = $property;
        }
        return $list;
    }
    public function __set($name, $value)
    {
        $names = $this->_getProperties();
        if (in_array($name, array_keys($names))) {
            $this->$names[$name] = $value;
        }
    }
    public function __get($name)
    {
        $names = $this->_getProperties();
        if (in_array($name, array_keys($names))) {
            return $this->$names[$name];
        }
    }
    public function toArray()
    {
        $self = $this;
        return function() use ($self) {
            return get_object_vars($self);
        };
    }
}

$nik = new Nik();
$nik->name = 'Nik';
$nik->function = 'Sr. Developer';
$nik->age = '32';

$result = $nik->toArray();
var_dump($result);