Array
(
    [0] => Array
        (
            [text] => Element 1
            [level] => 1
            [elements] => Array
                (
                    [0] => Array
                        (
                            [text] => Element 2
                            [level] => 2
                        )

                    [1] => Array
                        (
                            [text] => Element 3
                            [level] => 2
                            [elements] => Array
                                (
                                    [0] => Array
                                        (
                                            [text] => Element 4
                                            [level] => 3
                                        )

                                )

                        )

                )

        )

    [1] => Array
        (
            [text] => Element 5
            [level] => 1
        )

    [2] => Array
        (
            [text] => Element 6
            [level] => 1
        )

)