How to delete the specified key in this array

How to delete the specified key in this array
Array (
' Juan_tit ' =
Array (
0 = ' Roll One ',
1 = ' Roll two ',
2 = ' Roll Three ',
),
)


Now I want to delete this value with the key Name 2, how to delete it.
------Solution--------------------

$ar = Array (
  ' Juan_tit ' = Array (
    0 = ' Roll One ',
    1 = ' Roll two ',
    2 = ' Roll Three ',
  ),
);
unset ($ar [' Juan_tit '][2]);

------Solution--------------------
unset ($ar [' Juan_tit '][2]);
------Solution--------------------

$arr = Array (
' juan_tit ' = = Array (' Volume One ', ' Volume Two ', ' Volume Three ')
);
Print_r ($arr);
unset ($arr [' Juan_tit '][2]);
Print_r ($arr);

