array formating in php

I have an array ->

Array (

[0] => Array
    (
        [ID] => 3
        [TotalCost] => 0.00
        [Name] => Tim
    )
[1] => Array
    (
        [ID] => 1
        [TotalCost] => 19.99
        [Name] => Chris
    )

)

In php, I want to change it to ->

Array (

[Tim] => Array
    (
        [ID] => 3
        [TotalCost] => 0.00        
    )
[Chris] => Array
    (
        [ID] => 1
        [TotalCost] => 19.99          
    )

)

I tried few things but not getting desired result. Please help.