如何删除父数组并只保留子数组?

Here's the array:

数组:

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [name] => John Snow
                    [id] => 2
                )
        )

    [1] => Array
        (
            [0] => Array
                (
                    [name] => Arya Stark
                    [id] => 3
                )
        )

    [2] => Array
        (
            [0] => Array
                (
                    [name] => Tyrion Lannister 
                    [id] => 7
                )
        )
)
Array
(
    [0] => Ar