Creating dynamic array

Question

I have a problem with create a tree with array, i have an array like this:

            Array
            (
                [area] => Gerencia Pais
                [id_area] => 1
                [id_area_padre] => 0
                [nivel] => 0
                [hijos] => Array
                    (
                        [0] => Array
                            (
                                [area] => Gerencia Corporativa Desarrollo de Negocios
                                [id_area] => 2
                                [id_area_padre] => 1
                                [nivel] => 1
                            )

                        [1] => Array
                            (
                                [area] => Despacho y Logística
                                [id_area] => 48
                                [id_area_padre] => 2
                                [nivel] => 2
                            )

                        [2] => Array
                            (
                                [area] => Atención al Cliente
                                [id_area] => 95
                                [id_area_padre] => 48
                                [nivel] => 3
                            )

but i need the format like this:

            Array
            (
                [area] => Gerencia Pais
                [id_area] => 1
                [id_area_padre] => 0
                [nivel] => 0
                [hijos] => Array
                    (
                        [0] => Array
                            (
                                [area] => Gerencia Corporativa Desarrollo de Negocios
                                [id_area] => 2
                                [id_area_padre] => 1
                                [nivel] => 1
                                [0] => Array
                                    (
                                        [area] => Despacho y Logística
                                        [id_area] => 48
                                        [id_area_padre] => 2
                                        [nivel] => 2
                                        [0] => Array
                                            (
                                                [area] => Atención al Cliente
                                                [id_area] => 95
                                                [id_area_padre] => 48
                                                [nivel] => 3
                                            )
                                    )
                                [1] => Array
                                    (
                                        [area] => Desarrollo y Tecnología
                                        [id_area] => 84
                                        [id_area_padre] => 2
                                        [nivel] => 2

                                    )
                            )

The number of property "nivel" deep bounded array. I can do that whit a switch, but this is static i need create this tree automatically.

I hope you understood. Any answer can help. Thanks