I have an array, I want to be able to access the array like this...

Code:
$book['author'][0]
But it wont let me access the array, any reason why? I have to be able to access using its name, author, title etc.

Code:
(
    [0] => Array
        (
            [0] => author
            [1] => 
            [2] => 
            [3] => 1
        )

    [1] => Array
        (
            [0] => year_of_publication
            [1] => 
            [2] => 
            [3] => 1
        )

    [2] => Array
        (
            [0] => title
            [1] => <em>
            [2] => </em>
            [3] => 1
        )

    [3] => Array
        (
            [0] => edition
            [1] => 
            [2] => 
            [3] => 
        )

    [4] => Array
        (
            [0] => publisher
            [1] => 
            [2] => 
            [3] => 1
        )

)