Merge two array

Merge two array

I have two arrays
Array
(
[rows] => Array
(
[0] => Array
(
[color] => 0
)
[1] => Array
(
[color] => 1
)
)
)
and
Array
(
[rows] => Array
(
[0] => Array
(
[kaka] => 0
)
[1] => Array
(
[kaka] => 1
)
)
)
i want to merge that array, so the output is
Array
(
[rows] => Array
(
[0] => Array
(
[color] => 0,
[kaka] => 0
)
[1] => Array
(
[color] => 1,
[kaka] => 0
)
)
)
can anyone help me?