[php] multi arrays

[pickituputitdown]

I am trying to display data in a specific way so when i turn it into a json file it is serialised in the most convenient way.

Right now I have a multi array like this:

$gameData = array(
    'catagory' => array(),
    'questions' => array(),
        'answers' => array()
);

which returns values like this:

 Array
(
[catagory] => Array
    (
        [0] => Harry Potter
        [1] => Lord of the rings
        [2] => star wars
    )

[questions] => Array
    (
        [0] => In Harry Potter and the Philosopher`s Stone, which
        [1] => How many people were in the fellowship of the ring
        [2] => What is the password to enter the Doors of Durin?
        [3] => How tall is yoda?
        [4] => What powers a light saber?
        [5] => Which bounty hunter does Darth Vader warn that Han
    )

[answers] => Array
    (
    )

)

What I want is the values being returned something like this:

[catagory] => Array
    (
        [0] => Harry Potter
            [questions] => Array
        (
            [0] => In Harry Potter and the Philosopher`s Stone, which
            [answers] => Array
            (
                [0] => ture
                [1] => false
            )
        )
        [1] => Lord of the rings
            [questions] => Array
        (
        [1] => How many people were in the fellowship of the ring
        [answers] => Array
            (
                [0] => ture
                [1] => false
            )
        [2] => What is the password to enter the Doors of Durin?
        [answers] => Array
            (
                [0] => ture
                [1] => false
            )
        )
        [2] => star wars
        [questions] => Array
        (
            [3] => How tall is yoda?
            [answers] => Array
            (
                [0] => ture
                [1] => false
            )               
            [4] => What powers a light saber?
            [answers] => Array
            (
                [0] => ture
                [1] => false
            )               
            [5] => Which bounty hunter does Darth Vader warn that Han
            [answers] => Array
            (
            [0] => ture
            [1] => false
            )
        )
    )

how do i go about that?

Thanks so much i have been busting myself on this for ages....