Symfony Form PropertyPath for DataMapping

.gitignore

vendor

composer.json

{
    "require": {"symfony/form": "dev-master"}
}

composer.lock

{
    "hash": "cbb9759cdc4abf62b9bfde5d826357da",
    "packages": [
        {
            "package": "symfony/event-dispatcher",
            "version": "dev-master",
            "alias-pretty-version": "2.1.x-dev",
            "alias-version": "2.1.9999999.9999999-dev"
        },
        {
            "package": "symfony/event-dispatcher",
            "version": "dev-master",
            "source-reference": "30d3f5da80c2aeab15bcdb5a7d448d15bc294b23"
        },
        {
            "package": "symfony/form",
            "version": "dev-master",
            "alias-pretty-version": "2.1.x-dev",
            "alias-version": "2.1.9999999.9999999-dev"
        },
        {
            "package": "symfony/form",
            "version": "dev-master",
            "source-reference": "96755781bf3859c2fe4551dc8bce8a8ab3935321"
        },
        {
            "package": "symfony/locale",
            "version": "dev-master",
            "alias-pretty-version": "2.1.x-dev",
            "alias-version": "2.1.9999999.9999999-dev"
        },
        {
            "package": "symfony/locale",
            "version": "dev-master",
            "source-reference": "57539eb3caacf17c883a5fbe1bfdc7a98dedc854"
        },
        {
            "package": "symfony/options-resolver",
            "version": "dev-master",
            "alias-pretty-version": "2.1.x-dev",
            "alias-version": "2.1.9999999.9999999-dev"
        },
        {
            "package": "symfony/options-resolver",
            "version": "dev-master",
            "source-reference": "addf0f914af769838e2c4ada01ceb3e16d62bf83"
        }
    ],
    "packages-dev": null,
    "aliases": [

    ],
    "minimum-stability": "dev",
    "stability-flags": {
        "symfony/form": 20
    }
}

serializer.php

<?php

require_once "vendor/autoload.php";

use Symfony\Component\Form\Util\PropertyPath;

class Serializer
{
    private $paths;

    public function __construct(array $paths)
    {
        foreach ($paths as $name => $path) {
            $this->paths[$name] = new PropertyPath($path);
        }
    }

    public function unserialize(array $data, $object)
    {
        foreach ($data as $k => $v) {
            $this->paths[$k]->setValue($object, $v);
        }
    }
}

class TestObj
{
    public $bar;
    public $baz = array();
}
$obj = new TestObj;

$serializer = new Serializer(array('foo' => 'bar', 'bar' => 'baz[0]', 'baz' => 'baz[1]'));
$serializer->unserialize(array('foo' => 1, 'bar' => 2, 'baz' => 3), $obj);

var_dump($obj);

Output is

object(TestObj)#1 (2) {
["bar"]=>
int(1)
["baz"]=>
array(2) {
[0]=>
int(2)
[1]=>
int(3)
}
}