>>>> $_SESSION [test]   =  
Array
(
    [1_a] => 1_A
    [1_o] => 1_O
    [1_b] => Array
        (
            [2_c] => 2_C
            [2_l] => Array
                (
                    [3_i] => 3_I
                    [3_m] => Array
                        (
                            [4_j] => 4_J
                            [4_n] => Array
                                (
                                    [5_k] => 5_K
                                )

                        )

                )

            [2_d] => Array
                (
                    [3_e] => 3_E
                    [3_f] => Array
                        (
                            [4_g] => 4_G
                            [4_h] => 4_H
                        )

                )

        )

)


>>>> The DEPH of   $_SESSION   =   6

>>>> $_SESSION ====> STRING

test1_a~~ITEM~~1_A~~STR~~test1_o~~ITEM~~1_O~~STR~~test1_b~~ARR~~2_c~~ITEM~~2_C~~STR~~test1_b~~ARR~~2_l~~ARR~~3_i~~ITEM~~3_I~~STR~~test1_b~~ARR~~2_l~~ARR~~3_m~~ARR~~4_j~~ITEM~~4_J~~STR~~test1_b~~ARR~~2_l~~ARR~~3_m~~ARR~~4_n~~ARR~~5_k~~ITEM~~5_K~~STR~~test1_b~~ARR~~2_d~~ARR~~3_e~~ITEM~~3_E~~STR~~test1_b~~ARR~~2_d~~ARR~~3_f~~ARR~~4_g~~ITEM~~4_G~~STR~~test1_b~~ARR~~2_d~~ARR~~3_f~~ARR~~4_h~~ITEM~~4_H


>>>> STRING ====> $_SESSION

Array
(
    [test1_a] => 1_A
    [test1_o] => 1_O
    [test1_b] => Array
        (
            [2_c] => 2_C
            [2_l] => Array
                (
                    [3_i] => 3_I
                    [3_m] => Array
                        (
                            [4_j] => 4_J
                            [4_n] => Array
                                (
                                    [5_k] => 5_K
                                )

                        )

                )

            [2_d] => Array
                (
                    [3_e] => 3_E
                    [3_f] => Array
                        (
                            [4_g] => 4_G
                            [4_h] => 4_H
                        )

                )

        )

)