<?php

class Model
{
    public $data  = [];
    public $index = 5;
    public $accesors = [];

    function __construct($db = NULL){

        $this->accesorRegister([
            'password'  => function($pass){ return password_hash($pass, PASSWORD_DEFAULT); }
        ]);

        //parent::__construct($db);
    }

    function accesorRegister(array $arr){
        $this->accesors = $arr;
    }

    function apply($data){
        $accesor_keys = array_keys($this->accesors);

        foreach ($data as $k => $dato){
            if (in_array($k, $accesor_keys))
                $data[$k] = $this->accesors[$k]($dato);
        }

        return $data;
    }

    function create($data){
        $this->data[++$this->index] = $this->apply($data);
        return $this->index;
    }

    function get($index){
        return $this->data[$index];
    }
}

$obj = new Model;
$id  = $obj->create(['nombre' => 'Pablo', 'pais' => 'Argentina', 'password' => '123']);
var_dump(['id' =>$id]);

var_dump($obj->get(6));