----- 1 ----- <br/>
Array
(
    [0] => zero
    [1] => one
    [2] => two
    [3] => Array
        (
            [0] => three_0
            [1] => three_1
            [2] => three_2
        )

)
----- ----- <br/>
Array
(
    [0] => zero
    [2] => two
    [3] => Array
        (
            [0] => three_0
            [1] => three_1
            [2] => three_2
        )

)
----- 2 ----- <br/>
Array
(
    [0] => zero
    [2] => two
    [3] => Array
        (
            [0] => three_0
            [1] => three_1
            [2] => three_2
        )

)
----- 3 ----- <br/>
val= zero <br/>
val= two <br/>
<br />
<b>Warning</b>:  Array to string conversion in <b>/sdf/www/gm/h/how0909/php/sort/array_unset-1.php</b> on line <b>26</b><br />
val= Array <br/>
Array
(
    [0] => zero
    [1] => two
    [2] => Array
        (
            [0] => three_0
            [1] => three_1
            [2] => three_2
        )

)
Array
(
    [0] => zero
    [1] => two
    [2] => Array
        (
            [0] => three_0
            [1] => three_1
            [2] => three_2
        )

)
----- 4 ----- <br/>