Each value in the known quantity group is the same length, how to add a key key?

Each value in the known quantity group is the same length, how do you add a key?
Array
(
X=> Array (0,01,02,... 0x),
Y=> Array (0,11,12,... 1x),
...
N=> Array (0,n1,n2,... NX),
)
The length of each value in the array is known to be the same, such as: Array[x] and Array[y] two arrays of equal length

I want to add 2 more keys Array[a] and array[b], to become
Array
(
X=> Array (0,01,02,... 0x),
Y=> Array (0,11,12,... 1x),
...
N=> Array (0,n1,n2,... NX),

A=> Array (a,a,a,... b),
B=> Array (b,b,b,... b),
)
Is there any good way to do that?

(I just want to get all the keys first, and then get the value length of the 1th key.) And then populate Array[a] and Array[b])

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------Solution--------------------

$ar = your array;
$c =count ($ar [' X ']);
$ar [' A ']=array_fill (0, $c, "a");
Print_r ($ar);

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